I don't have either but done a fair amount of research and I'm not impressed, the scar has a decent reviews but for the money there are several negatives (flimsy stock, reciprocating charging handle, etc). The 716 has had some issues but can not recall exactly what then again I won't get one myself, I pick up a Knights Armament SR 15 mod 1 and been looking at a SR 25 as KAC makes a kick butt rifle.
Windham Weaponry just released their version of an AR-10. It is a collaboration of WW and POF and looks a lot like a DI version of the POF P308. Street price should also run under 1k if you don't want to pay the big bucks for an AR-10.
Also Ruger's SR-7.62 is out now for under 2k.
Just a couple other options for the more budget minded.
Hmm, i really want to handle the ruger but have not had a chance. I'm leaning towards the sig because it is a chrome lined, sub MOA rifle which is very impressive. But the fact that the ruger is under 2k is also a great option. How much is the POF new, like the set up you have?
I've shot both. Owned one. Most people probably prefer the SCAR. Are you really wanting a piston driven AR10? If money isn't an issue I'd go with a knights... the weight, accuracy, and recoil is better.