I doubt that there is a simple answer...
And there are several "right" answers...
but we were very happy with the 10 hp Yamaha Hi-Thrust outboard on our prior 4000 # boat.
That engine had the 25 inch leg.
It also had a removable shift and throttle assembly for remote mounting on sailboats.
I believe that it nowadays comes with power tilt.
It consumed only a half gallon of gas per hour at 5.8 knots, and was very quiet. There is now, also, an 8 hp version of that engine.
One thing to consider is mounting -- we were fortunate in having a transom cut-out. I would not have liked having an outboard (of any kind) on a bracket.
Best,
Loren in PDX