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A big dob has more light gathering power for sure. If you are interested in photography though, this is less of a concern. Loosely speaking, with photography you can compensate for aperture with longer exposures. With the modern computerized GOTO telescopes, you can add autoguiding functionality, which makes astrophotography that much easier.
Basically it comes down to this: For X amount of dollars you can have a big dumb scope, or a small smart scope.
The last consideration is your personal preference. Do you want to spend your time finding objects (get the dob) or looking at them (get the goto)
Clear skies,
Shane
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