jet drives arent necessarily slow (some of those drag boats that do 100+mph have jets (full size boats tho) they just have a certian rpm where it cannot get water fast enough and just cavitates like theres no tomorrow.

sub drives arent good with rough water because although they have good grip, the props they use cavitate massivly if ever intoduced with air because they are full submerged when the boats on plane, unlike a surface drive, so when you junp a wave and the prop gets out of the water and then goes back in, its cavitates.......

however, subsurface drives are quicker when accellerating from a stop because their position in the water has no air so it grabs the water immidiately instead of cavitating untill the boats on plane...

they also need more tourqier motors becuase of the extra resistance they have unlike surface drives...

so your pest bet would be a surface drive, they can take rough water without cavitating too much, they can reach a higher rpm, there is no point at which they are rotating so fast that they cavitate (well, and rpm that can be reached by an average motor unless running on more cells than whats "realistic") and they have less opposing force as subsurface drives...