I voted PS2. Not that I love the PS2 that much, but the variety, volume, and breadth of titles just can;t be beat, especially when counting all the PSX titles that can be played.

I do like the Cube better in an ideal world as far as reliability, graphics, and controllers, but I play my PS2 much more than my Cube since there's soooo much more good software to be had. IMO.