RE: The B/W Questions and Answers Thread
@EonEye: As far as exclusives go:
Black - Cottonee line, Gothita line, Vullaby line, Tornadus, Reshiram
White - Petilil line, Solosis line, Rufflet line, Thundurus, Zekrom
That's just the Unova mon. Also Petilil/Cottonee can be acquired in the opposite version via an NPC trade. If you want the full list of version exclusives,
look here. There is also the White Forest, but the Pokemon to be found there depends on the NPCs present.
As for competitively? Overall probably White is better, but you can still trade for others if need be.
@VictiniMan: Because they realized how annoying it was to get one TM from a Gym Leader and never being able to use it again.
Don't question it - enjoy it