I'm not sure if it's been suggested already, but I find the following website helpful, and surprisingly realistic:
You need a good computer monitor though (I have a 27" 4K LG).
It's interesting how when you compare a 60mm F15 refractor to an 8" f5 newt with Saturn as a target, with a 5.5mm eyepiece, there's not much difference. But with M42 it's a different story.
It's also really helpful if you match exit pupils. Then you can appreciate what a huge difference image scale makes.
For example, look at M42 with the 60mm F15 with a 32mm (about 2mm exit pupil). Then the 8" newt with an 11mm.
It's like ants to elephants. And it's more or less what I see in my actual telescopes.
It's one reason why I'm holding off getting a 4-6 inch APO refractor. Well, that and cost. There's not much I can't do already with my smallish refractors (up to 80mm F11) and the old light bucket. Especially when I get out to a dark site. It's astonishing what an 80mm can pull in upstate when seeing permits.