"First, no HT doc can guarentee any result" - fair enough, but I think you know what I was getting at.
"Second, I've seen Hasson and Rahal to me seems to be a bit better in terms of density" - agree to disagree, I have spend hours and hours looking at pictures from both and I swear that Hasson seems to be getting better density when he doesn't spread the grafts to the crown area. Take a look at cases where he left the crown area alone. Its all relative in terms of dense packing. When I consulted with both surgeons, Dr Hasson believed he could get 1,000 more grafts in one go than Rahal believed he could get via strip. They were going after the same coverage area, and because my preference was to leave the crown area alone, obviously Hasson's assessment was more dense packing due to the higher grafts. Your question was who will give you the greatest density. If Hasson can consistently get more grafts in a single session via strip, and you are specific that you prefer density over coverage, then I stand by my view that Hasson with get you better density than Rahal. As I said, we agree to disagree.