Oy, this is going to be a console war soon.
But I just have to answer the "HDMI didn't come with mah PS3"comment. Not everything comes with what you need, if you buy a flashlight you better be prepared to buy some extra batteries. Similarly, not everyone has an HD TV. My friend, for example, had a really crappy 15x15 TV, what the hell is he going to do with the HDMI cable that came with the PS3? The same thing happend to me, I had a crappy TV that didn't support HDMI, so if Sony included an HDMI Cable it would lose them more money. And if you can afford a "$600 console" then you should damn well afford an HDMI cable if you need one.
Anyway, on to the real subject, I say wait for their releases, check the reviews, and check any other info like Trophys/Achievments. Otherwise, ignore the graphics part of each game and if both are equally good then get the one you're most comfortable with.