I've had several of both and PSA Micro's. Here is my comparison of the PSA and CR920.
In regards to the Glock 43x, it's like a very simplified version of the CR920 with lower mag capacity. The CR920 you can have the lower capacity with a shorter grip or higher capacity with the same grip length as the 43x. The fact that you'd have to buy PSA mags and spend more money than the CR920 to get it close to the CR920's refinement and mag capacity, there is no value to be had.
Then you have the optic cut. The CR920 is darn near perfect in it's optic mount system. If you get the MOS 43x you've spent too much for a bad mounting system. If you get the 43x and want it optic cut, you could have bought nearly two 43x's by the time your done. The other option is to get the PSA micro slide that is optic cut, and again, why the Glock at that point?
The grip, handling, setup, and shoot ability of the CR920 is right out of the box. The Glock needs a lot and even then falls short of "Perfection".