I'll start out saying that I haven't tried the B and I only like the A in LR. However, if you are satisfied with the A, I'll say stick with it at least until you're ready to but more atomizers and tanks. There's a phenomenon on here that you have to watch. Something new comes out, you see a lot of posts saying it's the greatest thing to ever happen to
vaping, and a few weeks later, you start seeing posts about the problems with it and the solutions to those problems. It happened with the eGo-T, it happened with the CE-2s, it's starting to happen with the turbine tanks, and it'll probably happen with the type B tanks.
OTOH if you are ready to buy a new atomizer, I don't see any reason not to go with the type B and some type B tanks as long as the tanks are cheap. At a minimum, it's going give you more
juice capacity and it's probably no more trouble prone than the type A.