i posted this in another thread a few days ago about wakeskate sizing...
"size isnt as important with skates as it is with boards. the big reason for board sizing is because you wanna get as much pop as you can out of a board, and with wakeskating many people dont even jump, you wont see much of a difference. some of the pros ride 39" while some ride 42." i dont honestly think you will see a difference in board size. you might see a difference in board SHAPE, though. that's why there are different manufacturers."
if you have any other questions feel free to ask.