Aside from the obvious difference in the trampolines I was wondering why there is a difference in the first place? Are there other differences with the boats and is one prefered over the other?
The "Classic" with the one-piece tramp, is made to be easily disassembled, so the boat can be car-topped. The "Club" with the three-piece lace-up tramp, is more work to assemble, but gives you a more solid platform when you tighten up the laces. (The Classic's tramp tends to sag in the middle, but it does have cup-holders.)
If you never take it apart, it really doesn't much matter; both styles have won the class Nationals.