Probably Windows, because on Linux you have the AMD mesa driver and perf and valgrind-callgrind and kcachegrind which are all pretty good. For OpenGL there are renderdoc and apitrace. Unfortunately, the rr reverse debugger does indeed not work with Ryzen because the performance counters are too fuzzy, as mentioned in another comment.

I have been working with performance tools on Linux for over 10 years and occasionally debugged graphics issues.