Budget will drive the answer. For PRS22 and NRL22X - I see ZCO, TT, Kahles, Vortex Razor G3, and so on. I currently have a Nightforce ATACR 7-35 on my 22 rig as I wanted reliability over all else. I run Razor G3 on my PRS rig.
A used Vortex Razor G2 would be hard to beat for the money
Sadly budget is a limiting factor, can get a Nightforce Atacr 5-25 but don't think it will Parallax low enough.
Thanks for used Vortex Razor G2 (with 32yd Parallax) recommendation, so will see whats available.
I have run Vortex Strike Eagle, Bushnell Match PRO ED, Vortex Razor G2, Vortex Razor G3, and Nightforce ATACR 7-35 on my Rimfire. The Bushnell Match PRO ED may be the best "cheap" choice and the used RazorG2 would be great also