Rectangular trampolines were originally designed for high divers and gymnasts were they had to train at certain fall heights. The actual shape of the trampoline has an impact on the way the stress works on the springs themselves works. The g-force pull means that you can gain extra height on rectangular trampolines by basically propelling against yourself. The frame shape means that the greatest stress is evenly distributed along the length of the rectangle allowing the bed to strain and repel with the springs. Most rectangular trampoline beds are made using large weave mesh which allows free airflow through which in turn creates greater upward force. The frames are also designed using sprung steel in the frame, this means that the trampoline frame itself moves with the bouncer giving greater lift. With the listed factors in place you have the perfect formula for a performance trampoline. Is some cases the very high performance trampolines use a different material for the beds, hence the white colour beds you find in gymnasiums etc.

Round trampolines are the other hand are designed mainly for the home user and not designed to flow or lift like the rectangular trampolines. Round trampolines are designed with safety foremost, price secondary and price last. Most round trampolines nowadays are manufactured with a T Bar trampoline frame which is a very study, hard frame. The beds are made to accommodate more than one bouncer which means that have extra weave and don't allow for large weave. The springs are also designed to work under higher stress limits which means that the springs are made from hardened steel which has a big impact on performance.

With these factors in mind, there is no doubt that Rectangular Trampolines are higher performance units than round trampolines.