I agree with SMZ. Though I haven't thought about it as statistically as SMZ, I always find playing with Scipii a lot more easy than the Brutii. And most of all, when the Civil war starts, due to my extremely superior navy, I can blockade most of the other Romans' ports and thus drain their economy. The temples are important, but not as much as the navy. So for me, it's :

Scipii > Brutii > Julii.