The Hydralign three bladed feathering prop will most likely give you better motoring and better sailing performance compared to your existing
2 blade fixed prop ASSUMING
1. The diameter of the Hydralign prop is suitable for your prop aperture (and engine).
2. The rotation is suitable. I guessing your existing
Yanmar is either a Y or an S series
engine and these require a LH prop while most later engines use a RH prop.
The two main advantages of the Hydralign will be better
pitch control (i.e. adjustable pitch) and lower drag when sailing.