[JERSEYDEVIL]

either of those will work, camlocks maybe be a little easier to hook up but a good camlock belt is expensive and the cheap ones wont hold up well in offroad conditions. the hook style holds up fine but will get stiff if not wd-40'd once in a while. i used crow belts in the race car because they came in purple and they were bought through speedway. i use them in the 400 now.
as far as 2" vs 3".....in the race car 3" is a must for impacts, a 2" would tend to dig in more, although one time i wrecked so bad i had to massive 3" wide hickeys on both shoulders. in a buggy an issue it's a matter of what is more comfortable, i still use 3", they bother my wife so i use 2" in hers.