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Just a couple of points to clarify.
A 10" delivers 100/64 = 1.56x the light gathering of a 8" NOT 2x.
It is for visual that you will notice and benefit from the larger aperture more than for photography since the camera records light whereas your eye does not.
Objects will appear as white wisps in boths 'scopes only brighter in the 10" at the same power. The 10" will also show faint galaxies that may be invisible in the 8" but these galaxies will be barely visible in the 10".
The highest practical power will be 300x on both 'scopes. The sky will not allow better due to seeing. The image will be brighter in the 10" at the same power.
I would go with a solid tube 8" for portability and stability. No need for shroud and no need to assemble. This telescope will be for life but you can complement it with a 12" later for brighter views again 144/64 = 2.25x brighter. Being f6 the 8" will be kinder on your eyepieces unless you also want to invest in Tele Vue or others highly corrected to f4.
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