Eh, depends. Seems to vary from system to system. The pS3 is almost always plagued with problems, however. Expecially considering it's memory is split in two, instead of consolidated like it should have been from the get go.
This. If you're waiting for the Ultimate Edition, get it for PC. The mods and the overall stability make it a superior choice over any of the console ports. Xbox is a little more stable than PS3, but Gamebryo/Creative Engine games tend to be really, really buggy on PS3 due to the split memory issue. Xbox mainly has issues with crashing due to memory overload, and PC issues tend to stem more from the game's coding and engine than from the PC itself, so as long as your PC is decent you'll be able to handle it.
Still rather annoying - my PC copy crashes every few hours, so saving is ESSENTIAL, especially in the DLCs where the game may not autosave for several hours and then proceed to crash.