The 12" does let in more light, but having had the M12 and M10 side by side, the difference wasn't as much as I had expected, and we often forgot which we were looking through at any given time.
The 10" is more manageable for imaging too. I like the ACF scopes, not only is the coma extinguished but the optics and build seem better.
The only reason I gave up my 10" ACF was that I wanted a Hyperstar compatible scope, so went to a C9.25 Edge HD, but the Meade gave better views, especially on the planets, and its focuser was better.
I'd save the money and get the 10" and use that cash for the extra gear, Crayford focuser, dew buster, better mount etc.
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