But the question still remains.
Why should I use PCM?
The more I have researched this, and thanks to Keithb for the link on pcm versus ppm, I am even less convinced on PCM.
Bottom line for me is,
PCM goes into failsafe, never comes out. This is not just me, I have now spoken to 3 experienced flyers who have confirmed the same thing has happened to them.

PPM, sure, it glitches etc, but apart from somebody shooting them down, or a battery failure, in all cases, the 'plane was saved and the problem rectified.

No more PCM for me.

Thanks for all input