This subject seems to create a lot of animosity in helicopter forums.

Some people say eCCPM and mCCPM are the same as far as flying is concerned, others will argue vehemently that one is better. Some people even argue that there is no such thing s eCCPM or mCCPM - its all just CCPM

Personally, I fly a Raptor, and I know it is going to be some considerable time before I will find the limits of this heli.

Oh yes, there is one big advantage in eCCPM that I was reading about but it is not for the pilot / owner, rather it is for the manufacturer because it is easier and cheaper for them to produce an eCCPM body than spend the time to correctly design an mCCPM type.

In answer to your question, "For a beginner, is it important if it's mechanical mixing or electronic.? "

I would say NO, NO, NO.