Ruggo is 100% on the money. It starts with the game plan and then the type of player in each position to deliver on that plan. You could make a very good case for either player, depending on how Cheika wants to play. They both offer different things and at this stage I don't think I could say that one is definitively better than the other, due to their skill sets. In the main my preference is for a fetcher at openside, who first and foremost rules the breakdown (on either side of the ball). Close behind that skill are the other attributes I admire, like link play and ball running ability. Cheika may see it differently of course, but as a former back rower (a very good one at that and who played with some outstanding flankers) I would think he'd have a fair idea.