Hi Jorge,
It all comes down to light gathering (aperture) and thus what you are trying to achieve out of your telescope and the quality and detail of your images.
From my learnings, and feedback from what everyone has been saying, aperture is one of the most important ingredients.
I was almost hooked on a 10" but have only just realised that longevity of the scope, a 12" will give me more pleasure for longer.
Also think about portability and where you want to view. Do you have the room, vehicle etc etc??
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