Down here in south LA. the crabbers, shimpers are all running yamaha or merc. 75% more yamaha than merc. These guys earn a living with these work horses. 50/50 2-stroke or 4 stroke. These motors are running in shallow saltwater. Very silty water and either pulling trawl nets or hauling crab traps, sacks of oysters. Most are mounted on large fiberglass boats or 3/16 homemade alu. hulls.
Just up the road is the Acafly. river spillway. (Basin) Stumps, logs shallow water, water hycids, horrible on outboards. The crawfisherman.Trappers and commical netters are running Merc. opti and Yamaha. 100% on 3/16 alu. hull due to stumps.
These guys earn ther living with these motors. They run them 7 days a week no MERCY.
This is what we use as a ruler, What ever these guys are running you can bet it will hold up to our pleasure fishing and boating needs.
HOPE THIS HELPS