Do you have a rental place you can try out the variations? If so, great. It will give you an idea of what you like.
If not, and you don’t find the perfect advice here, remember that the fact you’re doing research is a great sign that you understand the pro’s and con’s, and you’ll be able to adjust nicely to whatever choice you make.
I, myself, went with a hybrid design. Both vest and back inflating. It is the "middle ground" solution. The model was Tusa Conquest. I love it.