Very happy with our Max prop... slick piece of engineering, that.
The Kiwi prop is much less expensive than the Max (Kiwi has a reputation for overpitching in reverse. This can be fixed by adding some limiting screws,) but it's definitely a notch or two below the Max. Folders by Gori and others are similar so do some pricing and research and decide accordingly.
Folders are fine if they are 'geared' to ensure that both blades always open together.. a half open non-geared folder can feel like your boat's coming apart at the seams. Our martec had worn and splayed the cheeks as well, so it was a source of vibration.
There are lower-profile fixed props too like the Campbell Sailer prop, we had a good experience with a 3 blade version but others have not had so much luck.. quite a cost savings, though over the others.
If it's in the budget I'd go for the Max or a similarly engineered one... then Kiwi, then a geared folder, esp if you're racing. But IMO the greatly improved reverse thrust of the Max is really worth something.
Originally Posted by fallard
.....and the Maxprop in particular if you can afford it and aren't towing a dinghy on a regular basis.
Could you expand on this?