Wow. As of right now, there's an exactly even split between A and B, with about a fifth (including me) selecting 'both.'
The tonal range and detail of B is better, but I prefer the colour of A. I'm assuming B is the new Portra and A is your beloved Fuji? I say this because personally, I always shoot Portra if I might be making a black and white later, and Fuji if I know it will stay in colour. I'm applying old preferences to a totally new situation I guess.