+1 on "doing what works."
I'm one of those that started out trying to use my drysuit only (full neoprene one) and it worked OK but then concluded it made more sense to use my BCD primarily with enough gas in the suit to not be squeezed. (And, with an uncompressed neoprene suit, one also needs to fight the loss of buoyancy from the suit compression so gas in the BCD is almost mandatory at any depth.)
Eventually, I, along with TSandM, was "encouraged" to use the dry suit as the primary bouyancy device (and by then was using either a compressed neoprene or bylam suit). I now use my BCD (wing) solely on the surface OR when I have extra weight (doubles/stage) OR when I'm diving wet.
One hears a lot about "muscle memory" and how it can be better to just use one system -- but I'm not at all sure that is really all that important -- once you are competent at both. It seems to me the issue of "muscle memory" is really an issue of practice and competency.
For example, driving a car. IF all one ever learned is to drive an automatic, there would be issues switching to a stick -- however, once one has become competent with the clutch/shift, there is probably very little issue of going back and forth. YES, one might find an occasional "oops" coming to a stop with one or the other, but generally something that is very quickly corrected.
The same is true, in my (perhaps uninformed?) opinion. For example, when I first dive wet after months of diving dry, I do find myself hitting the "button" on the front of my wetsuit (with no effect somehow) before remembering that I need to hit the wing inflator button (not always, but sometimes, especially when I'm on auto-pilot -- yes, there is some "muscle memory" carry over). BUT, that only happens once or twice and then I'm back to, "Oh, right, I'm diving wet and I'll use THAT set of memories" and then everything is back on auto-pilot.
The key, in my opinion, is to be competent with whatever configuration you have and then, when/if you change, make sure you take it easy for a dive or two after the change.
So, pick a system, get competent with it, and THEN, if you want, play with change.