I've only owned Black, so I'm unsure which way I'd sway.
I purchased Black because I liked Reshiram more than Zekrom, but also because it was called "Black" >_> I did, however, purchase White 2.
I do like Black, even if I really want to play White.
I think White has better locations (White Forest & Opelucid). They're just better.
I really like the futuristic music in Opelucid and in Black City in Black, but I would have liked to listen to the tunes of White. I liked White 2's soundtrack a lot.
But I think N should have always been searching for ideals. Therefore, I believe he should have sought after Zekrom no matter what. It just makes sense to me story-line wise. I think they player is always in search of the truth. You're never given a chance to choose between right and wrong in Pokemon, but you're still trying to take down evil organizations, and showing them the truth, I guess. That was lame XD
It was so weird in White 2 when N had Reshiram O.o
Kudos to Nonon! I agree with you ^w^