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Its not that Dob's see more but the size of the mirror - the first one you mentioned was 8 inches diameter on the EQ mount, the second was 10 inches; bigger mirror more light gathering power.
The focal length eg 250mm x 1250mm determines the magnification seen thru your eyepiece, lower the eyepiece number bigger the magnification.
You would be able to clearly see saturn/jupiter/star clusters/nebulae - with the scopes mentioned. THe dobs aren't that much bulkier - the tubes are nearly the same size - any big scope is buky to move around.
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