Games
There is bugger all and most out there are just nasty ports of last generation technology with pretty pictures.
Xbox is drawing the usual suspects of FPS style games but expect a lot of wacky-but-cool japanese games to be PS3 only. Depends what sort of games you like?
Xbox arcade is the best of both right now
Graphics
In raw power Xbox its superior to PS3, but the PS3 has a LOT more processing potential so it could do some amazing dynamic stuff (in a few years when people figure it out)
Load speed
PS3 is 20% slower
Other
Both are online crazy. Xbox live will be more usable and polished
Right now?
Id buy a wii