It just so happens that I tried them both ytd after accidentally finding out about the B3s while looking for an alternative to my over-ear cans and lurking in the V1.0 thread for a few days.
I actually like both their signatures very much, the VSD3S sounds brighter and has thumpier bass somewhat and is also very airy. The B3.. Soundstage is really.. Wow. Never would I have thought that an iem could have such a gigantic soundstage. The sound is a little more 'veiled' and dark in comparison to the VSD3S. However after a few minutes, I found my ears feeling a little tired while listening to the VSD3S and the darker sound of the B3 became really pleasant and enjoyable.
Very very very nearly just pulled the trigger on the B3s there and then but I managed to walk away to protect my wallet (for now anw lol).
And then I hear this thing about an upcoming B6???