The new Verado Pro’s are all L6 models. 6-cyl supercharged. The 200-300hp are actually identical motors off the production line, but they are programmed at different hp. You can actually buy a chip and flash a 200hp to 317 for low cost.
Personally I like the Merc. Mainly for the noise factor. I came from a 2 stroke and was sick of having to yell over the motor. I test drove a 200hp Yamaha and a 200hp Merc. The Merc was much quieter, so I went with that based on the reliability of both motors.