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Hi flyingbaby,
First, is the Skywatcher you mention really a 10"? The details you list have it an 8": 203mm diameter, & f/5.9 for essentially the same focal length.
Visually, a 10" dob is brilliant.
If you are after an astrophotography rig, a 10" is damn massive. If it is your first, you are really in for an uncomfortable learning curve. The main limiting factor will be the mount, and you'd be pushing the very limits of an Eq 6. You will have very little margin for correcting balance issues.
The difference between a GSO 10" dob & a SkyWatcher 10" today, I'd say no difference. Today these scopes are both really good quality for a mass produced instrument. It is more of the sales pitch that gets you. Me, a little less slick in advertising, but more value for money sways me towards a GSO. Depends also on where you are, what is available, and any freight charges you'd be up for.
You really won't have issues with planetary and deep sky objects with scopes this size. Photography of DSO's and the planets have different requirements.
Good luck with the choice!
Mental.
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