i can only answer question 3 since i dont own any of these console yet. sooner will.

imho,
ps3 - not much title right now, but worth wait for upcoming release.
xbox 360 - lots of game title and still growing, unlike when the xbox release which lack of game developer support.
wii - lots of family game.

which better? depend to your own taste. i will go for wii for family entertainment, and ps3 for upcoming rpg title perhaps soon? (like ps2, lots of rpg game title), and maybe xbox 360 for action gaming mostly fps type.

so no exact answer from me hehe.