Most of my experience is on 35 megs but I am in the US / Canada / Mexico at the moment flying on 72 megs.

I fly my larger, more expensive, stuff on dual conversion, it gives better interference rejection, no arguments there. However I fly combat where you will have up to 20 models up at the same time and pilots strung out on a line with single conversion and have no problems other than the odd glitch.

BUT not all single conversion Rxs are good for long range high threat environment flying. I have had no problems with Futaba and GWS. Others have been glitchy and I have discarded them.

N.B. I like PPM as I get a warning that the RF link is not solid with a glitch or two. I get asked to test fly quite a lot and the total lockout you get with PCM for a second or so really gets my adrenaline going. Perhaps I am a luddite.