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To me, the advantages of the M4-P are its black chrome finish (much, much nicer than the M4), the hot shoe, and 28mm frame lines (I shoot mainly 35mm, followed by 28mm). I'm aware that the M4 has a self-timer, but I honestly prefer no self-timer since it's easier to grip without one (and I practically never use it).
The only advantage of the M4 over the M4-P to me is the purported "classic Leica build quality". In fact, I reached out recently to legendary Youxin Ye, who told me that "it would be a pity to trade out an M4 for an M4-P, since it is one of the worst built".
I also asked YYe if I can install 28mm lines into an M4, but he said there is a shortage of MP frame line assembly parts from Leica USA at the moment.
What would you do?