Hi Jas,
You can't beat a dob for visual. It will give you the biggest aperture for your budget. A 6" refractor will only get you a quarter the amount of gathered light of a 12" dob. Light is crucial for observing galaxies and other faint objects.
Furthermore, a larger aperture will give you more resolving power i.e. sharper detail in objects you look at and that includes planets.
In any case, a decent 6" refractor will cost you many thousands of dollars.
Regards, Rob
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