Simply between PS3 and the X360? It's a toss up, but a lot of stuff is multiplatform. Say what kind of stories you want, and maybe an ideal suggestion can be made.
Well, some of the RPGs I liked were FFVI, Chrono Trigger, Xenogears, Kingdom Hearts, and FFXII. I'm not a big fan of the traditional turn based combat.
I really like scifi.