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Is this for visual or imaging?
Aperture kind of rules for both but protability comes into it. If they are both the same length then its just a matter of weight and diameter which shouldn't affect portability.
How heavy are each of them?
What is the weight ability of your mount?
As a general rule I think larger aperture with the constraints of portability and mount capacity would be the formula.
F4.8 would be quite widefield though for visual and you'd need some short focal length eyepieces or a nice barlow.
For imaging its an easy pick- the 10 inch F4.8. Large aperture and faster speed = easier to get a nice bright image especially if you have to travel to your site and the vagaries of clouds etc limit your total exposure time for an image. Although if you really wanted to go for broke on imaging you would choose their astrograph range rather than their Newt range. These are essentially the same as the ASA scopes.
Greg.
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