Answer to the question....nobody really cares what system you a are using...
But as an instructor I definately prefer a stab jacket for me...on the surface, the back inflate system always has the face down tendancy, even partially inflated...When I need to talk with my students or assist them in any way, the back system is a pain to work with. Rescues are more difficult to accomplish. In high seas the face down tendancy is more pronounced.
Finally, in the ocean there is always a chance you will be floating a long time especially drift diving.
But as an instructor I definately prefer a stab jacket for me...on the surface, the back inflate system always has the face down tendancy, even partially inflated...When I need to talk with my students or assist them in any way, the back system is a pain to work with. Rescues are more difficult to accomplish. In high seas the face down tendancy is more pronounced.
Finally, in the ocean there is always a chance you will be floating a long time especially drift diving.