Hi there, I have 2 softbox 32" and 48" that I use mainly for outdoor portraits with an AD200. They are "umbrella style" octabox like the one illustrated below.
While that design can be limiting in orienting the light downwards, it provides an extremely quick arrangement for setup and folding back: you open them like a simple umbrella and just put on the white diffuser sheet. That way your flash is basically pointing inwards and bouce back off the silver interior surface.
The alternative bowens mount would entail to use the bowens mount adapter which would place the flash at the vertex and pointing directly towards the diffuser.
Do you have any direct experience if the fist design arrangement is poorer in terms of quality of the light?