i've got 6 satios i think they have a better power to weight ratio
i've flown other guys os 4 strokes they seem like they may have just a fraction bit more power but they are heaveier only had one of my satio a 300 twin need repair(just got it back) but that was after 5 yrs use maybe 20 - 25 gals thru it. and if i kept it lubed it proberly wouldn't needed repair then(i learned from my mistake).
for 2 strokes unless its for speed or racing os is great run them in all my copters. 3 or 4 in airplanes they're great.
roy