In light of all the trouble people are having with the OS .91FX and the fact that OS has changed it Company policy from producing Highes possible quality to producing the highest possible profits even at the expence of quality and warranty claims, I would have to pick the ASP. I have one of those really sick OS .91 FX's that runs for S**T and Hobby Services will not warranty. No more OS two strokes for me. Eventhough I have 3 OS 4 strokes (Older ones) that run very well, I will not take a chance on another one.