YS is the best performer I think but I voted Saito 1.25. Actually it was a tie between that and the OS 1.20. Why not YS? While they run like a striped a** ape, they can be more finicky to set up, tune and maintain. Don't get me wrong, it can be done but maybe just not the best idea for a first 4-stroke.

I do like the looks of that Thunder Tiger too. I may have to check one of those out someday.