I'll keep this short. I don't have screenshots or HD comparison videos, or even underwear on. But I will do my best to give my impressions based on the demos I played on each system.

First of all, I WILL be getting this game. I was a bit hesitant at first because actually I was underwhelmed a little bit. But after playing through the demo five times I absolutely saw the potential: the skill trees, the saber upgrades, unlockables, etc, EXCEPT THEY BETTER FIX THE GODDAM AWFUL TARGETING SYSTEM. but even that won't keep me from buying it.

360 version:

Pros: Color saturation, specular effects (i.e. shiny), character animation and textures all seem slightly better. Rumble effects are better. Physics seem to have more weight
Cons: The fucking controls / controller , CONSTANT slowdown

PS3 version:

Pros: Silky smooth framerate (I tried as hard as I could to make it slowdown), controls feel better, controller is better, particle effects, force lightning and lightsabers look better.
Cons: The fucking targeting system. Demo Install YAWN

CONCLUSION: For almost the first time of doing this I would say the PS3 version is a clear improvement, in fact I wouldn't be surprised if the game had been lead-developed on the ps3. It's amazing what a difference slowdown makes in yanking you out of immersion. The controls simply feel tighter as well, like your mom. Anyway, not surprised if I get shit for this, but I want to say obviously I own both systems and love them both equally, just like I'll love both my children equally. unless one of them is gay.