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Welcome Rastis,
there are others who will give you a much better answer than me.
Light gathering power for fainter objects is the way to go, ie 10" is better than 8". This is called aperture. A 10" reflector or refractor is better than a 8" reflector or refractor. When you have objects like the moon or planets that are really easy to see ie light gathering power not really an issue, the refractors are preferred for contrast.
Planets like venus and jupiter reflect so much light that when you try and image them with a camera, you have to cut the amount of light down as it is too much!
Faint objects like galaxies and nebulas, you need all the light gathering you can afford, ie a reflector on a dob mount.
Hope this helps and again welcome!
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