AMD V Intl
Nvidia V ATI
Cable v ADSL
Windows V Linux
Liverpool V Manchester Utd - no contest! LIVERPOOL!
Anyhow, each console is different.
I prefer X Box, project gotham racing to name one is good, although gran turismo 3 is good on PS2. I like X-Box more, but best thing is find people who you know to have them, then as to perhaps borrow if you ask nicely and get a feel for them.
There will be many disagree and many agree, but play before you buy! Hire games, borrow console and play for a weekend!