I prefer PCM because, it will generally warn me of an interference issue not detected on the ground. With the elevator, rudder and aileron servos set to hold position and the throttle set to go low... at any time a throttle back is noted, I'm warned and it is time to get the plane close and make a landing.

About six months ago, a rebuild of a Ultra Stick Lite was finished and flowm a few times and then suddenly the warming came. The problem was too much spark plug wire caused a loop that evidently pressured the boot loose from seating fully on the plug. A small hose clamp fixed the problem. Without a warning to heed, I might have gotten too far out and lost control.