Hi and welcome
Personally if it was me, I'd go with the Dobsonian.
It has the advantage of the better aperture and a wider field of view; and it's often easier to start observing with an Alt-Az mount, which is basically what a Dob is.
As regards astrophotography; the CG4 mount would probably be stretching its payload for imaging - and the Mak is not an ideal scope for starting AP with, quite apart from needing driving motors; I'd say you would be better off with something like a 80mm refractor.
I would suggest getting the Dob, and if you're interested in AP, consider getting a compact equatorial camera mount, such as the Star Adventurer, that you can use with a standard dSLR camera and a telephoto lens.
You have said you're looking for your 'first' scope after all