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As a general rule of thumb, unless you have absolutely perfect seeing conditions, on top of a mountain at some 15,000 feet, resolution wise you never need to go past 10" aperture. I would actually be interested in whether the "Adaptive Optics" offered by SBIG (AOX) really helps much in bringing down the resolution considering that it isn't a true Adaptive Optics.
In a more practical sense, the CDK 14" is better than the CDK 12.5" because of the extra aperture. It works out to be a ~25% increase in photon capture so ~25% shorter imaging times for the same image.
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