Seems like a simple question with a simple answer. But in reading reviews I see quite a few reviews of "she gave a great blowjob with perfect hand and mouth motion."
For me, I enjoy and HIGHLY prefer a blowjob with no hand at all. It really takes away from the sensation, especially when there is any pulling down on the shaft. Hand on the beans, no problem and probably adds to the enjoyment.
So for me, all mouth and the deeper the better but keep the hands off the shaft!
Others?