Thru the last 50+ years we probably have had almost every type of inflatable available. The least desirable were the ones with full plywood floors, and aluminum side stringers which the plywood slid into. They were heavy and a bear to put together--even on a 62 foot boat. The largest was 13' and planed well enough to single water ski behind. We had a RIB--impractical for a c Dory--probably the one we liked the best was an 8'6" slat floor roll up, and the 2.5 HP suzuki. Some of the 2 hp motors are just not large enough to push a larger boat agains the wind. We also had several "dough-nut" such as the Avon Red Seal. Our current boat, seems ideal: It is an high Pressure air floor, 9'6", about 60# wt, and we can carry it on the cabin top of the C Dory 22. It can take up to 10 hp, we usually use a 3.5 HP 2 stroke Merc--weight about 30 lbs We also often use it with the light weight Torqeedo Traveler 1003--about 3 hp equivalent.
We do have the Garhauer Davit for hoisting aboard, and it really helps. We also have a "cockpit position for the Garheur for motors, ice chests, and even MOB. I am 80 and Marie is about 72, we both have back and arthritis issues, but can handle this size boat, without a lot of problem. I did make a lifting spreader bar, which gets he boat higher, and well balanced: There are two different diameter pipes for the garehauer davits--so be sure to know what you need.
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Note that if we didn't have the radar strut, the dinghy could be further forward. But it rides fine, with just a little weight on one of the SS cockpit Bimini bows.
This dinghy is so comfortable that we can easily spend an after noon "cruising"--and 2 to 3 knots--or much faster, if we want to burn the fuel. Particularly with our bigger boats, the dinghy was our "station wagon"! There have been times we have gone over 30 miles from the "mother ship" . Even carried a "kicker" on the bigger RIB and inflatables.
My Son's 25 has a flatter roof, and I am going to suggest the Garhauer Davit, and the 9.5' inflatable floor, since he has a 9.9 hp kicker. It should handle his family of 3 plus 2 dogs...