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Hi Konstantionos,
I am no expert, but I feel that with HEQ5 you would be better off with a telescope that is light, fast and gives you more arcseconds per pixel. Both telescopes have a similar mass (maybe CT8 is a tad heavier), but from the stats CT8 should be a nicer match with your camera (wider FOV and shorter exposures) and with your mount (more arcseconds per pixel - somehow easier on guiding).
But frankly speaking, if you are interested in imaging nebulae, I would not pick neither of the scopes with HEQ5, but instead would get a small fast refractor that would give about 2.5 arcseconds per pixel and would implement drizzle in image processing. In that way the FOV would be greater, tracking significantly less demanding of the mount thus images would be sharper and imaging time much shorter.
Kind regards
Suavi
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