Well.. For a starting point, the ED80 will be much easier to use.. a 600~mm focal length is a lot more forgiving than a 1250mm. It will be easier to balance, easier to setup etc... and come 6 months time when you decide you want to step up to a guided setup, you already have the guide scope, and can start imaging through the 10" which will give you bigger image scale..
It will just be much easier for you to start out with the ED80 than the 10"... Thats not to say it can not be done, hell, my first decent deep sky image came out of my C11 @ 1750mm focal length, however that was guided, I doubt it could be done unguided.
I would recommend going for an ED80 if your budget allows, and starting out like that....
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