I've owned both. While I love the Eotech's reticle, it's simply not as rugged/dependable/KISS as the M21.
The M21's extremely rugged, comes w/an excellent QD mount & ARD, and the reticle is sharp & crisp even w/my astigmatism.
Downside to the M21 is that the reticle can wash out under certain lighting conditions (like aiming out a window into bright sunlight from a dark room).
Regardless, I've sold all my Eotechs and the M21 w/triangle reticle is my current KISS optic of choice (YMMV).
Tomac
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"His Universe, His rules." - Tomac
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