I recall MANY years ago a topic like this, in the end the bottom line was for small engines < .21 the crank induction was the best. The gray area was the .21 to .28, as we have seen there is more that one way to get there...
There are ALWAYS different paths to take, options and what not. If the .12 class was raging there would be more efforts put in this. There is a pretty good interest in the .12, but compared to the .21 class it is tiny. (Well at least around my area.) Mind you we have some SUPER fast .12 run here!