I would say Sci-Fi War is probably my favorite type of war in Games, Modern to especially those 1000+ plus battles in ARMAA2.
The problem is though a Modern War/Sci-Fi Scenario is much harder to imagine. Few games simulate it perfectly. There are just to many factors involved, Tanks/Infantry/possible air. The only game I have seen it simulated perfectly on epic proportions is ARMA2 in battles like this.
http://www.youtube.com/watch?v=8KK6F...eature=related
I would really like to buy that game and do a 1200 Infantry/300 Tanks vs 1200 Infantry/300 Tanks. Then I could get a feel for how an epic battle battle would be like in Modern War.
The Total War series has simulated Ancient/Medieval War perfectly and Mod have given attention to the Fantasy side of things. Its just much easier to simulate since the Warefare is much simpler then modern/sci-fi war.
So what do you guys like the best?