1. Multiplayer experience?
WIFI is free and its GOOD
2. Extra's of purchase with the Console?
NOPE only MIC if u want to talk or extra controllers
3. Game Choices?
Killzone and Little Big Planet are awsome games on PS3 that XBOX doesnt have
4. Skill of Player's in both Console's?
BOTH OF THEM ARE GOOD
5. Other Info
Both of them are good, buy the one that ur friends as the most and if u really like watching movies in HD, get PS3 cuz it has a integreted BLURAY