All i can say is xbox has been in my life seen childhood so did computer and playstation but if im gonna pick something im going to pick somewhere where people are "actually good" so xbox is the way to go.
Xbox 360 for console online gaming
PS3 for a lot of single player games
Wii for stuff to do a parties
PSP for a lot of import games that I own
DS for good ol' Pokemon
and of course,
PC for those MMOs.