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Peter,
What exactly do you want to compare between scopes? Same aperture but different scope design? Different apertures? The combinations of variations are huge because an optical system is not just the scope that is the active element, but so too is the eyepiece AND the eyeball at the end. Eyepieces alone come in dozens of designs and different designs work better in some scopes than others - eyepieces are not neutral in their response to how different scopes handle the light going through them.
And then you have the human factor which is not just the multitude of eye conditions, but also personal circumstances, preferences (such as photo vs visual), Brand prejudices, and even understanding of optics and what one finds acceptable and another person doesn't.
So, your question about comparing different scopes, what are you wanting to compare? Aperture? Design? Quality? See what I mean?
I would normally suggest you go to a local astro club meet to look through a wholeot of different scopes, see how they all work and the many different mounting systems that are available. MOUNTS are another factor too! But with thd current Covid-19 situation this is difficult if not impossible t o do.
Ok, so maybe tell us a bit more about your situation (you live in a house or unit?), your expectations, experience, etc. This will give us a better understanding of you and tailor suggestions best for you
Cheers,
Alex.
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