Which campaign starts do you enjoy the most, and how do you handle them?
I particularly enjoy playing Carthage in the Grand Campaign. Your regions are spread out and you're likely to need to fight a two-front war soon. In Iberia, you're fighting the Turdetani; if you make peace with them, you'll probably be fighting the Edetani. In and around Sicily, you're likely to be fighting Rome and possibly Syracuse.
This provides a challenge which I enjoy. Around Sicily, I find that a fleet of cheap melee ships can reliably defeat the transports of a Roman legion, but if Syracuse attacks on land, or if Rome marches through Syracuse to attack me in Sicily, I'll struggle to hold Lilybeaum, my foothold there. Usually, I use Lilybaeum as a temporary shield against Rome and Syracuse while I try to expand in Iberia. Iberian expansion tends to be challenging, when your enemies bring armies of swordsmen which can reliably defeat Carthage's main line of spearmen.
Which Rome II campaign starts do you enjoy the most and how do you handle the challenges they present?