My first two BCDs were both back inflate models (Zeagle Ranger and ScubaPro Nighthawk). For more than a decade I have done recreational scuba instruction using jacket BCDs. I have used a BP/w for my own diving and for my technical instruction for quite a few years now. I think I can safely say I am pretty familiar with all three styles. I will firmly agree that if you are a good diver, you can do a basic recreational dive happily and comfortably with any of them. I was, however, struck by a difference only a few days ago during an instructional session in a pool.
When I am doing pool sessions normally, it is to teach OW students. I use the same gear as the students--jacket BCDs. I try to get my students reasonably in trim, putting weights in pockets on the cam bands to try to balance out the weights on the weight belt or the integrated pockets. (I use both during different pool sessions.) It's not easy to get the trim right that way, and that includes with myself. I do the best I can, but it isn't quite right.
The last pool session was different because it was a technical class. Even in the pool, for technical classes I usually use my dry suit and steel doubles, but in this case I used AL 80 doubles, a steel BP, and a wet suit. I had some other gear as well, of course. I did not need any weights. For quite some time, I was just hanging in place watching my students work their way through their skills. At one point I was thinking how absolutely effortless it was for me to just hang in place horizontally, without moving a muscle, while I watched them. I was struck by that because I had only a few days before taught an OW class with the jacket BCD and my attempts to distribute the weights to get my trim right. It was not nearly so effortless to hold my position. Some fin sculling with my feet was necessary.
I guess if I had to sum up the ideas scattered in this post, they would be:
1. A good diver can enjoy a dive with any BCD that fits, and that diver can look pretty good in any equipment.
2. A BP/W makes it easier than a jacket BCD to maintain good trim, so divers who are not concerned about good trim while they dive will not notice the difference, nor will they care about it.
3. A skilled diver is more apt to be doing the kind of diving where the differences stand out.