Not Tiesda, but here is an observation somewhat related to andretsin's comment.
I have raced formula for several years, sometimes in very light winds. I have found that I can make better upwind progress while slogging compared to others that are just planing. With just enought speed to plane, upwind performance is very limited. Of course, we are talking about boards of the same width.
I assume that cholo is talking about slalom or freeride boards that are planing. In this situation, I would agree that wider boards plane quicker and will likely point higher earlier than narrow boards. However, once at full speed I am not so sure. It depends on thickness of the board in the tail, width in the tail and rail design, so wider may not be better upwind when at speed.