ORIGINAL: Mr67Stang
Your putting up two engines that are not even compareable. The .55AX will outperform that .56 FS any day. If you had asked about a Saito .82 FS then it would have been a different story.
Well that's why I asked about it here

I wasn't really sure how they would compare. They are the biggest engines of each class that I can get and that I could squeeze in a couple of different air frames I'm considering.