I think foiling is clearly faster, consider Sailrocket, Hydropter. Control seems to be an issue.
I was talking to an A class builder and he maintains their boats are now going to weather with only about 1/3 of the lee hull in the water. Imo, that has to be both higher and faster.
Btw, I exchanged posts with Wayne Marlow yesterday and he has put an A class rig on his F16. Any idea how that might work?