I've been on both Seroquel and Abilify. Seroquel worked like a dream but made me eat so much that I wanted to stop it. No depression while I was on it, only one mild hypomanic episode.
Abilify didn't help the depressive side of my illness but neither did it cause the excessive hunger like Seroquel did.

I think the only way to find out which one is best for you is to try it yourself. Everyone is different. But unfortunately switching medications can be a long and hard journey.