Ive always found the rectanglar ones to have signifcaly more bounce, when compaired to a simlary sized round one, not haveing used your trampoline or your cousins i cant speak for yours, but my own and friends ive used, the rectanglar ones have always had a much greater bounce in the center "/ the round ones place you futher away from the springs at all time, hence you just dont get the same upthrust "/











