One other thing to remember is LOCATION!
A 5" refractor at a dark site beats a 12" dob in the city! This isn't always true as on a good night the extra aperture will help with bright objects (moon, planets and some globular clusters) but I've seen galaxies (faint smudgy hazy) and planetary Nebula in my 5" that I would never expect to see with my 12" at home.
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