White because:
White Forest- The less Pokemon I need to transfer the better.
Version Exclusives- Reuniclus, Braviary, and Lilligant.
Older buildings > Very futuristic buildings (IMO)
Now, I am going to get Black eventually too. It was just a deciding factor of which game had more things to offer me, so I would buy it first. White had more benefits than Black for me because all I really liked about Black was:
Fighting Drayden instead of Iris- Not that I don't like Iris, it's just I don't like her as a gym leader.
Reshiram > Zekrom
Black City- Ability to buy all the evolutionary stones instead of FINDING them.
Three reasons for each- could just be a toss of a coin, right? All in all, I feel that better version exclusives (ones that I would use) and the ability to catch a bunch of lv.5 Pokemon from older gens had more value than my preference of Black's version mascot and Drayden.
Well- tomorrow is the day I OD on White. I even went out of my way to do my weekend homework today, which as we all know MUST be saved for Sunday night.