Surface drive pro-drive with the pro-drive rock guard. Have experience with go-devil long tail, mud buddy 23 mini and 27 Pro drive. Pro-drive the best for rocky bottoms because of their rock guard.
Surface drives are faster, turn sharper and are easier to drive than a long tail. Pro-drive has a clutch and electric trim, is built heavier than Mud buddy. Although the Mud Buddy 23Mini is a good motor.
Was at explorer industries in Edmonton last week they have the new 27 kohler with efi and three blade prop on a 16X48 Jon. Same boat we have except for EFI and three blade.
Ours with 2 guys cruises at 38 kph downstream on NSR and 33-35 upstream. 90 to 100K on 25 liters of gas. Will bounce along and over rocks and sandbars. Can take off in 8 inches of water without touching bottom. Not sure how much water you need but have blasted over gravel bars with gravel sticking out no problem and gone over sand bars shallow enough that the motor was riding on the top of the sand, can feel it through the handle moving up and down, but we did not even slow down, , don't know how deep the water was. Will go good with three guys, have not tried with more.
Jets can probably handle shallower water for a longer period of time but use way more fuel, would love to try a side by side run with a outboard jet to see if their is much difference in the ability to go..
Lawn mower engines, can run them wide open all day long.
Have ran the Wabasca River, NSR from Drayton Valley to the Saskatchewan border, the Pembina from Sandgudo to the mouth then up the Athabasca to Vega ferry with mud boats. They are very affordable and capable boats for our rivers.
27hp is about as big as you want to go with a 16X48 jon. Explorer is supposed to be getting some 18 foot jons, with a 36HP Mud motor you would be able to carry a bigger load...
My thoughts on a good river boat, 18X60 or wider Jon with 36 Pro-Drive, rock guard and a Center Console.. Nicer for longer trips then a tiller. Would be able to take a bigger load then a 16X48.
I am a big mud boat fan.