Phoronix published a review on the Radeon Linux OpenGL Driver Continues Giving Its Best Against Windows 10 A quote from the article:

With having around a Windows 10 installation this week for the latest Windows 10 WSL vs. Linux benchmarking, I also carried out some fresh benchmarks of the Radeon gaming performance between Windows 10 and Ubuntu Linux using the very latest drivers on each platform. This time around a Radeon RX 580 and RX Vega 64 were used for this benchmarking.

 Radeon Linux OpenGL Driver Continues Giving Its Best Against Windows 10 @ Phoronix