i think it is more a question of what your kids are into. judging by the ages i'd say they would like the wii better. the wii is geared more toward smaller kids and adults. the 360 seems to be geared toward the teens. if they are into graphix and shoot 'em up, driving, adventure type games then i would suggest the 360. that being said the wii can be enjoyed by your whole family and does, in some instances, give you a little work out.

oh yeah, at LEAST two controllers is a must. i believe it takes up to four and that is a really good time!