Cool to see a comp with lots of variation in preference both ways.
B- More depth, sense of the space, more balanced frequency response, cleaner, more extended highs, open, a bit overbright up top, a bit recessed in the upper mids.
Listening straight out of the laptop on HD650s and asjusting foobar EQ for preference I make shallow valleys centered around 300-440Hz and 14kHz and broad flat hills centered at 70-100Hz, and 3.5kHz.. above that dropping down.
Before EQ, A has what sounds like a peaky midrange honk that bothers me, rolled off highs, less clarity and space. Listening straight out of the laptop on HD650s I EQ in a deeper valley centered around 620Hz and a smaller dip around 7-10kHz in a generally rising response with a hill cresting at 3.5kHz, and rising again from 10-20kHz.
EQ'd they are much closer, but I prefer B (4060)