Neither. The best supercharger is a postive displacement twin screw type, like the one's made by Kenne Bell.
BTW, this isn't a tuning question. It's better placed in tech. Either way I wouldn't expect a lot of replies. Your question ranks right up there with "which short throw shifter ... which cat-back ... 4.10 or 3.73 gears." All are posted at least once a week, so you only get a couple of people interested in jumping in every time. That's why you should use the search for some questions.