... in my niche market world of personal preference, superiority does exist in a slim and trim keymod.
Can you elaborate? Being serious, honestly.
I looked at several makes of handguards prior to buying into either system or any brand for that matter, and the handguards I looked at that came in both were no different in "slimness" (dimensions), and very little in weight. For example, 1oz difference in weight for a SLR Ion Ultralite 15" handguard (11oz for mlok vs 10oz for keymod, less for shorter ones). It appears to me the weight difference is only due to less "hole area" overall on the mlok vs keymod. Other brands had less weight difference between the two types.
KAC's keymod handguard (14.5") is larger diameter and heavier than the SLR's I mentioned above. I don't see a mlok handguard listed on their website (see it other places, but no dimensions or weight listed).
I personally didn't find any superiority in components/attachment/etc.
