And Volvo is more $$$ for same part that would be used on a Merc. Here's an example I experienced when having my Volvo serviced...
Fuel pump went on my 5.0GXi. Cost, including installation - $1000. Not kidding. Marina damn near fell over when they heard their price on it. Why you ask?
Fuel pump for a Merc was $100. Same model year, same engine displacement.
And no, the Merc and Volvo parts aren't interchangeable from what a few marinas told me.
In my neck of the woods, Volvo dealers are drying up. One marina told me why....Volvo makes it difficult/impossible to locate parts. You have to be willing to put the leg work in. Merc's are more plentiful, parts cheaper which is why I have one on my boat....and constantly get po'd about that darn shift interrupter! But that's for another time altogether.
IF, and that's a mighty big IF, you have a good marina that will service it, then by all means the Volvo is a notch ahead of Merc having owned both now. Volvo is smoother and does not have that stupid shift interrupter.
**This is comparing the Volvo SX drive to the Merc Alpha 1 Gen II drive.