Trusting [SPOILERS]

[NoldorinWrath]

So if it came down to it, would you rather have House Frey or House Bolton guarding your rear during your retreat from superior forces?

[Lord AcidRocker]

Frey, because I didn't disrespect them and they have not much of a reason to me over

Bolton will you over no matter what

[SoulGamesInc]

From a purely strategic point of view I'd have to say Frey because as long as you don't give them a reason to look for a better deal, they'd stay loyal... depending on just HOW outnumbered you are. Bolton on the other hand, would go out of their way to find a better deal. On the other hand... could i pick the "screw them both" option?

[Pyres Δt Varanasi]

None of them I would never feel comfortable with them guarding my back .

[The Forgotten]

I pick both. If I am going to get screwed, then I go all out.

[GenAntilles]

Frey, as a man of my word who keeps his oaths or dies trying, I would have nothing to fear from Walder.

[Deska140]

I would trust House Frey, of course.

Spoiler Alert, click show to read: 

When I read in the third book what Robb did, I was just mad at him. The Red Wedding was a horrible crime but before that, I can understand such anger for this dishonor ...

[ButtSwag]

Woah, why is everyone going againt Bolton? From what we've read they were pretty reliable supporters until Robb screwed everything up. Roose helped Eddard in Robert's rebellion, and he helped Robb throughout the war of the 5 kings until it was clear that the war was lost. It was a golden opportunity to become more powerful and make sure he stayed alive. I doubt he was planning on betraying the Starks before the war.

Frey on the other hand? What have they done that proves they would fight for/with you in a battle. Nothing.

[SoulGamesInc]

Woah, why is everyone going againt Bolton?

Lots of reasons...

Spoiler Alert, click show to read: 

This prove's Roose was a traitor the moment he heard about the Ironborn...
"Robb summons Roose to aid in retaking the North from the ironborn. However, Roose has decided that the Stark cause is lost and is ALREADY plotting with Tywin, Walder Frey, and his acknowledged son Ramsay to bring them down."

Bolton slowly bleeds his kings force's from the inside...
"He sends a full third of the Northern infantry (including none of his own troops) to attack Duskendale, knowing they would be massacred by the joint Lannister/Tyrell forces."

Bolton wiping out more of his king loyal men...
"On the march to the Twins, he takes his time when crossing the Trident and allows his rearguard to be ambushed by Gregor Clegane. On the other side, he leaves the Stark loyalists to guard the river, taking only Dreadfort and Karhold men with him; the latter still incensed by Robb's execution of their lord Rickard."

Bolton making his last act of betrayal...
"During the Red Wedding, Roose mumbles an excuse to get out of the hall. The bedding and playing of "The Rains of Castamere" is the signal for the Freys to attack their guests. Roose returns into the hall dressed in mail armor. Robb has already been wounded by arrows. Roose approaches him and kills him while saying: "Jaime Lannister sends his regards"

All of this leads to House Bolton finally getting what they have always wanted, control of The North. But this is not the end of Roose's plans, as he clearly wants to be King in The North, a title House Bolton has desired for 1000s of years. I don't think Stannis was part of his plan...

IF this is an open battle, no politics to be gained and merely survival... I'd go with Bolton.... a un-trustworthy turn-cloak he may be, but he is a skilled commander. Just keep an eye on him, at all times.

[Deska140]

The main problem is how Robb screwed everything up.
I said I would go with Freys but yeah, both families were power hungry opportunists.....
When the victory was not possible, they wanted to keep their interests intact.
Freys joined because of Robb's promises and Late Walder had an obsesion of getting the family very, very high and all of major houses thought of him as a nouveau riche. After Robb's insult(we may hate the Freys but still, Robb fed up in a big way) , Frey began to look for a better deal.

Boltons have always wanted full control of the North and the course of events went really well for them...

[Mount Suribachi]

Yep, I'm going with the Bolton's too. Roose was entirely loyal up until the point he realised Robb had just lost himself the war. And he was surrounded by Freys at Harrenhal, I wonder if there were no Freys there, would he have turned his cloak? And don't forget Roose was quite happy leading the feint against Tywin, knowing it was doomed to failure.

The Late Walder Frey on the other hand...

[ButtSwag]

Exactly. If you had to retreat from a superior force, Roose would be your man. he's not afraid of battle, as he proved when he fought Tywin. If the Frey's were civering you, they'd more than likely try and kill you while you were running.

[ButtSwag]

The only reason Roose betrayed him was because of the Tyrell-Lannister-Martell Alliance that was formed, which everyone knew would beat Robb. Not only that, but Robb dishounered his promise to Walder Frey, and screwed everything up. The Boltons were loyal to the Starks for a long time, and if Robb continued to win the war and not make stupid decisions, Roose would never have betrayed him. He didn't even need to win, as long as he kept the Freys happy he would have been able to retreat back to the North via the Twins, and hold off anyone at the neck. Roose's betrayal wouldn't be possible if Robb didn't anger the Freys, as they were the ones who orchestrated the red wedding.

[Uriyaca]

Bolton. Plain and simple

1) Roose is awesome
2) It were the Freys which orchastrated the red wedding, not the Boltons. Although Roose did send a lot of the Stark loyalists to their doom......
3) Walder Frey was always known for his very, very low loyalty, and has already betrayed Hoster further before the War of five kings. Before the War of five kings, correction: before the Starks were lost, Roose did everything that Robb said and was very loyal. Roose is no fool. He wanted power. But he was not unloyal, he just knew how to swoop in on a great opportunity
4) There is a reason why the Boltons always hated the Starks, because they were once kings and the Starks defeated them and the last Bolton king was forces to kneel to a Stark. However, Roose was more loyal then Frey, although that Walder had no reason why to be disloyal to the Tullys.

[SuicidalBrownie]

Boltons, for the reasons depicted above, and the fact that Northmen would probably have more defensive abilities. Roose is, of course, a boss of the highest level, and he would have served loyally if Robb hadn't ed up so badly. And I don't think he is responsible for his crazy son. That's just Ramsay's nature.

[Archon Patriarch]

Bolton. Plain and simple

1) Roose is awesome
2) It were the Freys which orchastrated the red wedding, not the Boltons. Although Roose did send a lot of the Stark loyalists to their doom......
3) Walder Frey was always known for his very, very low loyalty, and has already betrayed Hoster further before the War of five kings. Before the War of five kings, correction: before the Starks were lost, Roose did everything that Robb said and was very loyal. Roose is no fool. He wanted power. But he was not unloyal, he just knew how to swoop in on a great opportunity
4) There is a reason why the Boltons always hated the Starks, because they were once kings and the Starks defeated them and the last Bolton king was forces to kneel to a Stark. However, Roose was more loyal then Frey, although that Walder had no reason why to be disloyal to the Tullys.

EXACTLY. Our blades are sharp. Another Bolton fan! The Frey's are the rats, the Boltons are the Oppotunists. If anything they stuck to their guns because they are the Starks Arch enemies, what did you expect of them?

[Archon Patriarch]

Bolton. Unless during my retreat a whimsically stupid plan is unleashed by the Ironborn which is then met by an equally stupid plan from a literal bastard who then communincates such to his Father who just so happens to have a key prisoner in his hands because my mother'ss an even bigger mug I'm okay. I'd like to point out, Roose is cautious and diabolic. The Freys are weasels.

[Mount Suribachi]

This prove's Roose was a traitor the moment he heard about the Ironborn...
"Robb summons Roose to aid in retaking the North from the ironborn. However, Roose has decided that the Stark cause is lost and is ALREADY plotting with Tywin, Walder Frey, and his acknowledged son Ramsay to bring them down."

No, Roose starts plotting when he hears of Robb's marriage to Jeyne - its in Arya's chapters at the end of ACOK. He knows the war is lost, and he is trapped south of the neck, between the twins and the Lannisters. Everything else he does is a consequence of that, knowing that like himself, Tywin is a pragmatic man who will offer his enemies "generous terms"

[Gallus]

Neither, I'd rather have my back unprotected.

[Pyres Δt Varanasi]

Neither, I'd rather have my back unprotected.

Indeed