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I can't tell you which is better. They have different attributes. Either might suit you better.
I have a Vixen Polarie. It's very compact and very simple. Possibly better if you're going to be flying it back and forth to the States. The Star Adventurer has more features. They probably have similar tracking precision.
The Star Adventurer has the option to have an autoguider attached. Adding a autoguider will add a lot of stuff to the kit making it less portable - guidescope, autoguide camera, computer.
The polarie cannot have an autoguider attached.
Both will work best with wide angle to standard(50mm) lenses though I have seen photos with these using telephoto's up to about 200mm.
I would suggest you learn fixed tripod astrophotography first. The 810 will do that easily then move on to using trackers.
Cheers
Joe
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