I wear either boxers or boxer-briefs depending on the situation. Boxers are more comfortable so I wear them to sleep in and when I'm hanging out at home or with friends. But boxer-briefs look sexy so I wear them when I'm going out or when I'm with a girl
It really has nothing to do with "support" for me... I'm not jumping up and down so I don't see why I need to hold my balls in place. I have no problem letting them hang low and free