I also have both, padded and standard VCAS with metal adjustment sliders and padded VTAC with built-in heavy duty push button QD swivels LaRue Tactical version.
You could get the same as my built-in swivels padded VTAC from LaRue Tactical, it also have an additional side release buckle at the front end of the sling.
I like mine both but it depends what I'm going to do with my slings, if I'm on the move, walking, running, climbing, or using my hands more, I prefer to use my VTAC sling because it could be tightened snug to the body and would not easily loosen.
If I'm shooting most of the time or my hands are on my carbine all or most of the time I prefer to use my VCAS which I don't tighten, my main use of it is to just retain my weapon to my side, muzzle down, while I use my sidearm.
Both my slings are mounted at the front near the front of the receiver and at the rear on the buttstock QD attach point, so when I let the weapon hang to use my sidearm, the barrel naturally hangs downwards.
Both these slings could be converted as a single point sling if you wish, by installing a lower receiver end plate QD mount and using a 2 to 1 point triglide convertible QD sling conversion adaptor (ref. links below).
http://www.impactweaponscomponents.com/category/plates/
http://www.impactweaponscomponents.com/category/mount-n-slot/sling-adapters/