My 2 cents worth, I have two of them. One with a satio 100 and one with a YS 91. As to my flying style. The YS 91 out performs the 100 hands down.
Faster out of the hole, more reliable, never a cough that I get form the 100. weight I don't see as a factor. Both have more then enough power to do any thing you want it to do. Knife edge loops do require that I start with more speed enter the loop with 100.
I was going to switch out the satio for a YS 91 but have decided to sell the plane instead. Just don't need two of them.