The only down side to a 4 stroke is they typically weigh more than a 2 stroke. Most newer 2 strokes run as clean as a 4 stroke. They must meet the same EPA requirements. 4 strokes do run much quieter than 2 strokes, but require oil changes. If I were to decide on an engine, the most important...
I have an 1860 alweld with a 115/80. It runs 35 mph with 2 people, fishing gear, and a full cooler. It has factory welded trim tabs on each side. The boat does not cavitate unless you trim the motor to high, which is about over 25% up. Hope this helps.