The Yanmar and Volvo sail drives are different. They will both however, take the same type of props.
There are so many different opinion os Sail drive vs shaft. My initial reaction to sail drives was I was getting a lesser product. After being in the yard a couple of times, I have concluded that I am just fine with my sail drives.
I whole heartidly agree, pick your boat on the 186,282 other things that will differentiate the boat. Not the sail drive.
With that said, I have the Yanmar SD20 sail drive. If I had my choice I would not select this unit. It is made for boats that can be readily lifted out of the water
. I have two complaints. 1.) The specs say change the lubricant every 100 hours. To do this, the specs say, remove the boat from the water. Grrrr... 2.) To replace the zincs the spec say remove the boat from the water. I am finding this to be less of an issue. My zincs are holding up VERY well. Not much wear after being in the water for 1.5 years. I was going to change them at last haul, but they didn't need it.
, which is the next Yanmar Saildrive up has fixed the lubricant problem. If you get an engine
that gives you that choice, I'd have no reservations about suggesting it.