What anti-cant / levels are the cool kids using? I'm torn between the U.S. Optics swivel rail mount and the Flatline Ops articulating ACCU/LEVEL.

I like the USO because it will be easy to move between rifles and is easy to mount. The only downsides I see is that I generally run one-piece mounts so I don't have much rail space left on the receiver and it assumes your top rail is level/true.

The ACCU/LEVEL has caught my eye because I like how you can mount the angle degree indicator plus I'll probably be able to mount it closer to where I'll want it. The downsides being price and that you'll probably want to mount it in the shop to ensure it's leveled properly.

Any insight/guidance on these or other anti-cant devices?