I think the bigger decision really depends on where you plan to take your boat. One of the reasons boat manufacturers chose Yanmar, Volvo, Onan etc. is because of the global network of distributors. I think if I were in your shoes and were serious about these boats offered for sale, I would ensure I had a good comfort level about being able to service the engine and obtain parts in remote places. That is if you place to go to remote places.
With best regards,
Sailing Vessel - Cream Puff - SM2K - #275
Currently cruising - Bonaire