Go-To / Tracking vs not
For photography you will need something which tracks the stars as they move through the sky. Furthermore you need something which will "rotate" the view as it tracks (like an equitorial mount).
The difference between the two dobs you've selected ... one has "go-to" which means once you get it set up for the night you can tell it to "go-to" a particular object and it will move there itself for you. It will then track the object as it moves through the sky for the night. The other doesn't have this feature.
EQ6 vs Dob
If you're going to get the EQ6 then you only need the OTA (Optical Tube Assembly) rather than the whole Dobsonian setup. e.g. something like this ...
https://www.bintelshop.com.au/Product.aspx?ID=9172 The EQ6 basically replaces the mount the scope sits on. The EQ6 does the go-to and tracking that you need for decent astrophotography.
On the other hand, if you want a portable, quick to set up non-photography type thing, then the dobsonian is the ideal.
Hope this helps a little.
Cheers,
C.