To me the difference was huge: with Link cable and Oculus OpenXR, my “headroom” (as displayed in Tray Tool overlay) was at best -200 but would easily deteriorate to very unstable -500 to lower than -1000.
I agree that there must be other factors and issues that made my Link cable worked so badly in MSFS. It’s a good thing we can have two VR solutions here that may suit different people with different expectations.
BTW, I have a slow CPU which often becomes the bottleneck in MSFS. Lesser CPU usage may mean big difference in my case.