I personally have chosen Covenant. In my 900 hours of play time, 500 on my latest toon, i had previously left it alone. It is small and a headache to clear of the previous owners stuff. Yesterday, I cleared out the toons, and the torture factory across the lake to set up shop there. Then I broke my one big self imposed rule. I used the console to clear it of the previous inhabitants junk.
I'm not sure if this is the best place for a robot building factory. It is however somewhat isolated from settlers. Except of course a provisioner.
I have set up about 300 worth of defense in heavy laser turrets and rockets. So hopefully I can work in relative peace.