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I prefer BW over BW2 purely on the basis of pooling together only new Pokemon on the first playthrough. it was an amazing experience I haven't felt since this specific game, now that every new generation in the series gives you just 11 new Pokemon to enjoy, and 200 new formes. My forcing me to leave my "comfort zone" I gained so many new favorites and used some really weird stuff.
BW2 is good but that formula just doesn't work for me, and in fact, i'd say it's too good to a detrimental effect. The entire game feels like a romhack in the way that both Pokemon selection and locations are assembled, it feels really weird to play, and quite frankly the the beginning of the game is a big bait-and-switch when you find out that Unova becomes a full on rehash past the first two gyms.
I didn't find the story terribly interesting compared to original BW either, and it stands, BW2 is the only Pokemon game I bought at launch that I just never finished until years later.