Personally I would like the paddles: B mode brakes too hard for my liking, D sometimes isn’t enough, so I keep shifting from D to B and back. The paddles would allow me to stay in D almost always and gently increase braking using the paddles. It would also avoid the ‘clunck’ sound when going from B to D at standstill (from the lever itself).
I think that B mode triggers maximum braking possible, and that is similar to the maximum using paddles.