Black > White, it has the White supremacist on the cover and catchable.
I'll probably go Samurott again. No interest in either other starter, and he gets good type coverage with Megahorn.
I thoroughly enjoyed Black and White because without any mainstays, you are discovering things for the first time like in RBY all over again. I must have fucking raised 3 or 4 whole teams in Black to level 80 of just new pokemon, was pretty fun really.
I think I might be in love with Galvantula though