Not a Merc guy persay, but for the money I’d buy the Merc. Carbed or injected not going to be a big difference. Always a lot of new old stock motors out there. It’s still going to have new motor warranty. On that boat I would not go over that 20. Only difference on injected motors, easier to start at times and a little more fuel efficient. On down side it has a computer on it so something else electronic to go bad.