My setup is a 9.9 Evinrude, with a Terrova 101 to fine tune and steer.
The best thing about the 9.9 2-strokes is that parts are cheap and plentiful, the design has been around since the mid-70's, and unless you are running straight gas in your main tank (I pre-mix for my 140HP 2-stroke), then you don't need a spare gas can on the boat for the kicker. If you are running VRO, then you would have to think 4-stroke, OR, an extra gas can. 4-strokes are complex, NOT cheap for parts replacement, more maintenance, and although quieter, they are higher overall long term cost.
Just my 2 cents.
(I have a Sea Nymph Great Lakes Special 19.5' boat)