reply from divernva You can get horizontal with a jacket, and you can end up vertical with a back-inflate system. So I meant to imply that a back-inflation system will promote horizontal trim more so than a jacket.
So the one undisputable differentation is squeeze.
first I use a jacket and love it and second its is a personal choice
and it works just as good horizontal as your wings, back inflation , bladder type second I dont feel no squeeze you talk about yes older jacket had lots of it , but allot othe newer are designed some what diffrent less squeeze ect and more stream lines ect so personaly I believe its a personal choice and to use what you feel comfortable with !!!!!!!!!!!!!!!!!!!!!