LittleBigPlanet are like the only games I love on the ps3, everything else is so disinteresting.
I haven't played the Ratchet and Clank Future games either just yet.
Everything else like ports for the ps3 suck fucking ass.
As for Xbox, never owned one, but for awhile I've wanted to play Viva Pinata and Ilo Milo, based picks ZekeWatson!
Those two games are a good excuse to try 360 emulators, Ilo Milo has a PC port, but it's tied to the Shitdows Store I ripped out of my system.
Plants VS Zombies Garden Warfare once upon a time was an Xbox exclusive.
Ports for the 360 where actually good, like the original PVZ, and the Orange Box! (both aren't bad on ps3, but they lag a ton at a lot of points in the later halves of them)