Well I will tell you ive run fm and am for years on nitro with some glitching but not much my range was good as far as I needed to go with a truck. As soon as Iswitched to brushless am wasnt cutting it and fm wast far behind. Tons of glitching my range was terrible just was not a fun experience. I tried moving my receivers all over twisting wires braiding wires and nothing worked until I swapped to 2.4ghz. As far as proof Idont have any documented just what ive seen. I have never seen my 2.4ghz glitch never compared to my am andfm that did all the time.As far as range goes I dontknow they both went really far but I do trust my 2.4ghz more because when Iam far Inever see it glitch or anything. I think another factor in this am fmdebateis where you live. I live in a heavily populated areawith a bunch of businesses around so lots going on in the air.