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If I could magically turn my KM rails into Mlok, I would in a heartbeat.
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Funny you mentioned that. Last week I ordered two BCM MCMR rails, and a MLOK NSR to replace my KM rails by the same manufacturers. It was an easy swap since they use the same barrel nuts I already had installed. I already had MLOK rails on other rifles and knew I preferred that mounting system, but I just loved the BCM and Noveske rails so much I didn't mind KM in those cases. Now that they offer the same rails in MLOK it was a no brainer.
Overall I much prefer MLOK, but KM has one advantage and that's the mounting depth required behind the rail. KM accessories don't seem to protrude at all under the rail, whereas MLOK can give some interference around gas blocks and the like. That said, MLOK bests KM in every other way...mounting strength, return to zero, feel, looks, etc. Keymod will be dead within a couple years.