This is an often, and hotly debated topic and associated with many myths.

Some simple facts

- HOLD is not fail-safe
- all PPM units will be twitching uncontrollably long before the interference level will cause a pcm unit to stop listening

I won't debate that you can fly aircraft without problems on ppm... the difference is what happens when a problem occurs.

When I lose that tenuous radio link, I want the power delivered to my blades to drop to minmum and the flightpath to be as predictable as possible, not surging around erratically . It's about safety , not saving a replaceable (although relatively expensive) piece of equipment.

PCM delivers on this requirement, PPM does not. It's a pretty simple choice to me.