The C9.25" OTA is a stunner, as a fair chunk of those astrophoto folks out there will attest to.
The Mewlon is different, but to my mind better. Not hugely, but better is better. It doesn't suffer so much wioth the dew (no corrector), and overall the build and optical quality is or should be way better, BUT....... you will pay more for it.
At f13 or so it isn't really a photograpic instrument, but would be perfect for luna/planetary imaging.
Both will require a similar sized mount, so it really just comes down to cost and what you want.
P.S. I had the Mewlon 180, and regretted selling it, the 210 (or better still the 250) would be a dream scope.
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