p.s. actually, although I like more the A tones, it's clear that B film (due to the more light gathered) reveals more details, so yes, a bit of each one but the truth would be looking at them at effective equal speed. (Just to be clear, I'm NOT questioning your testing method, just seeing a difference in light gathered between the two images)
The only thing I see - assumed you used same aperture and shutter time for each shot is that the two films seem to have different exposure settings, which is particularly evident in the last 3200 sample. B film seems to get from half to a full stop of more light each time.