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Hi & welcome to the forum.
I can't comment directly on the individual mounts in question but I would suggest going for the bigger sturdier mount if at all possible. A good mount is absolutely vital for astro-photography.
From a quick internet search it looks like the Sirius EQ-G is similar (if not identical) to the Skywatcher/Synta HEQ5 that is so popular & is considered by many to be about the smallest viable mount for photography through a telescope.
I assume you are in the northern hemisphere from your location so a polar-axis scope would be fairly easy to use with Polaris to help you align it (our stars near the south celestial pole are quite faint making using polar-scopes a challenge in all but the darkest skies ).
Others with more direct knowledge of the mounts in question might chime-in with their thoughts.
Good luck with whichever one you choose!
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