RE: PPM, PCM ?
Hi SJN
PCM works by filtering the signal so noise doesn't get thru. When a Receiver goes into it's programed fail Safe it doesn't just stay there. The Reciever is constantly looking for a Signal so it can return out of Fail Safe.
While it is true that PPM will show u a hit better you could program Failsafe in PCM to warn you as well. For instance maybe have it drop the Gear if it goes into Failsafe. Also flying PPM you won't have your engine automatically shut down or throttle back like PCM will.
My 2 cents is only Fly PCM and do a very good range check.
Ian