 4 Stroke v. 2 Stroke, midrange torque and ride...
To just say that HP is HP really doesn't matter. Since on any power curve HP doesn't come into play till the higher rpms. Torque is what planes the boat and allows it to stay on plane. Just by design a 2 stroke gets 2 power strokes to one in a four stroke. So for given equal engine sizes and HP outputs the 2 cycle by design should provide more torque.
Even in the 2 stroke DFI technology the number of moving parts are still less than a 4 stroke.
To compare apples to apples of a like given HP output compare the Yamaha F200 cubic inches 204.6 to the HPDI and EFI 2 stroke which only displaces 158 cu inches. Same HP but this shows that the 2 stroke is capable of delivering the same power with less displacement.
In today's world, since the 4 strokes cost upwards of $2,000 more than the comparable HPDI, I would lean towards the HPDI. Same HP. about the same fuel economy, hardly any smoke.
$2,000 will buy a lot of gas! | 
