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C9.25 has slightly brighter images.
C8 Edge is easier to cool due to vents and less mass.
In my observing conditions I place a higher priority on cooling so I chose the C8 Edge. Visually both provide pleasing views (once cooled) with the C9.25 having less outer field aberrations than the 8" and 11" standard SCT's, though the outer field is better again in the Edge scopes.
I have the AVX mount and like it a lot. It's sturdy having the heavier duty tripod, it's not heavy to move, next to no backlash and the setup and alignment is very easy.
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