I know that for a good 5-6 months post release it was inferior and they're having problems with DLC right now but is the vanilla game on PS3 as good as the vanilla 360 version?

Well, here's the thing, they're essentially the same with only modifications of code for platform. So, really, hardware is your limitation. Being that Sony hasn't even been able to figure out how to help get it going, the proprietary plat is really showing its age, as all prop plats eventually do.