Sorry I thought it was a compliment.
I did get to sprint briefly against the one WaveWalker I saw. It was the newer model. I was solo in a not-too-fast tandem Outfitter with no ballast or front plug and was pushing water in all directions. We stayed pretty even. It should have been able to dust me but.... It had the hull advantage, but the Hobie had the Drive advantage. It wasn't impressive.
The best prop system I tried was custom designed by Steve Ball who also has raced some hydrofoils among other things. Here I'm pedaling his converted fiberglass Heritage Nomad (16' long x 28" wide -- almost identical dimensions as the Adventure):
His boat happened to be in the Bay to Bay race this year (5 mile) and did very well. It came in third behind the 2 Hobie Adventures also entered. Props faster? Using same ballpark hulls, I'm not convinced.
Adedal, since you're a prop fan, let me make a case of the Mirage Drive being a prop Drive as well. The fins are nothing more than two single bladed, oscillating, contra-rotating propeller blades spinning on their drive shaft. Because they don't need a 360 degree sweep, the blades can be twice as large, providing the acceleration and stump pulling torque of a prop twice their size! Unlike most props, they are variable pitch so they can operate more efficiently across a greater range of boat speed and RPM (relatively speaking). As you know, most HPV props are designed to be most efficient at one RPM, one boat speed and one thrust loading.
So there you have it -- you've been driving a prop job all along, and a pretty fast one at that!
And to answer your final question, it would depend on whether you're racing on a road or a rock pile.