I have both keymod and M-Lok, plus picatinny. They all have pluses and minuses. I like the keymod for ease of installing accessories. Picatinny for toughness and repeatability, M-LOK is kind of in between them both on ease and repeatability from what I have seen.
I have all, and will keep using all. I tend to set up a rifle/carbine with the "kit/accessories" and not move from one to the other. So it makes no never mind to me.
I do think that the M-LOK is more popular, but I don't have any definitive proof to that statement.
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