I think that every boat is so different that it is impossible to compare my '05 Tige with Perfect Pass to someones '97 (whatever) with dial speedo.
I am 6ft, 220, and I like to ride at between 18 and 22. I feel that the extra speed only makes me catch an edge quicker, and fall harder.
Back when I skied, I would always want to go faster, no matter what, so that I could leverage through the course at short line lengths to make up for my poor technique. I would want 36 or faster every time.
Which is why I like to ride now, easier falls, more fun.
I like the thumb system, up/down. How can you go wrong??