So I finally stepped into this generation so it's time for me to start posting here a bit :D
I bought both White and Black, for starters. I preferred Zekrom a bit, which helped me choose the White version. Another part that caused trouble were White forest and Black city. While I prefer concrete irl, I love nature in games, and White forest looks like a really zen place.
Therefore, I took White, and gave my sis Black. No doubt, I'll play around with Black version just to see the Black city, but I think White was definitely a good choice. :D