Leupold QRW rings or American Defense one piece mount on 308 AR variant?

[Mags]

Looking for a set of quick change rings/mounts for my AR variant in 308/7.62x51.
I want to be able to switch to irons and back and maintain zero.

I have it narrowed down to the American Defense one piece cantilever mount or Leupold QRW rings. Help me decide.

Leupold: http://www.midwayusa.com/viewproduct/?productnumber=525008
American Defense: http://www.midwayusa.com/viewProduct/?productnumber=148803

 

[madcratebuilder]

I looked at both those for my AR10, the Leupold made the short list. I keep coming back to the ArmaLite one piece mount. No decision yet.