Well, by pulling up the handy Wakeworld Gear page, I have access to two videos explaining all the features. The descriptions tell me that they have the same rocker height (although if I remember correctly, the Watson is a later kick, giving it more abrupt pop), with the Watson being a little wider. The One has fewer bottom features (the Watson has a center spine and some channels), and rounded edges in the middle, although it looks like they have tried to do something similar with the Watson this year.
So from what I've read, the One is faster, the Watson has more pop.
And here are the links to the gear guide:
http://www.wakeworld.com/products/in..._detail&p=5801
http://www.wakeworld.com/products/in..._detail&p=5529