Well, even if all the boats are the same, you have to wait for the tail enders, right? Matt and Gina are going to be waiting for everyone else most of the time! So that's why I like the 6, 1/3 shorter, less waiting, more racing and it puts more emphasis on the starts, as you have 1/3 less time to dig yourself out of a hole.

Also, sailing Uni as I usually do, it's one less take-down at C mark which is where I lose a lot of time.