I have viewed the moon and planets through a lot of scopes, from small refractors up to large truss dobs. The lesson I have learned is that aperture rules and IMO its not worth sacrificing significant aperture just for a tracking mount.
FWIW, I would not use an eq3 for anything, nor an eq5 for anything bigger than an 80mm refractor or a 127 mak. Anything bigger deserves a heq5 if you dont want frustrating wobbling every time you touch the scope.
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