My experience with imaging the Moon and Jupiter with a 4" f9 Vixen ED refractor and a Celestron C9.25 verifies what Robert (and John & Steve) have said. The C9.25 leaves the Vixen for dead - in this case, aperture is most definitely king.
The views of open clusters in the Vixen 4" f9 ED look awesome due to the excellent optics - the classical diamonds sprinkled on a black velvet cloth analogy springs to mind. The C9.25 "appears" to show "bloated" stars, but often this is because the longer focal length means I am using a magnification of say, x235 compared to x90 on the Vixen using the same eyepiece.
I am also a confirmed equatorial mount person, so I am heavily biased towards the GEM because of its GoTo and tracking capabilities.
Cheers
Dennis
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