From what I understand, when buying robotic scopes it tends to be a matter of optics vs convenience. Manufacturing computers and motors etc can be expensive where-as without them, the cost goes into better optics. But there is also the matter of size and portability and the ability to let the computers do all the searching for you. Don't take my word for it as I too am a very new astronomer, but if you strive for the best end result, I would go with as big aperture as you can afford.
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