Go with the FX. While the LA is a good engine and you would do fine with it, I think the FX is going to be a little easier for somebody just into the hobby. The LA's have the air bleed low end adjustment, and it's a fine art being able to tune one. I had just one engine with this on it and I won't have another. It's definitely a learned skill to tune the low end on one. The needle valve low end adjustment on the FX is a lot easier to adjust and isn't as frustrating for beginners

Hope this helps

Ken</p>