I'm for roll -> kick.
For me it's very difficult to really start the rotation with a kick when I'm fully rotated on one side. In order to do this I should kick strong but this is not the goal (with fins it's easy and funny by the way because you have more leverage, a naked foot anchors less). In my case the rotation starts by rhythm and gravity of the recovery arm, and the kick gently finishes the action. It's the same with 6bk.
Curious to hear about others,