Hehe... I haven't even played through a whole 4th gen game yet 8D I came further in White than I did in Platinum even, I think. Maybe I should finish that 5th gen game sometime xD So that I can begin playing BW2. Maybe.
I have no idea what differs between them yet xD But judging only from the looks of the legendaries, X all the way. Totally cool FORESTREINDEERMOOSETHING.