Phoronix published a comparison review between the latest Windows 10 and Linux drivers for Radeon / GeForce GPUs A quote from the article:

Given how fiercely the latest open-source AMD Linux driver code is running now up against NVIDIA's long-standing flagship Linux GPU driver, you might be curious how well that driver stacks up against the Radeon Software driver on Windows? Well, you are in luck as here are some fresh benchmarks of the Radeon RX 580 and RX Vega 64 as well as the GeForce GTX 1060 and GTX 1080 Ti while being tested both under Microsoft Windows 10 Pro x64 and Ubuntu 16.04 LTS while using the latest AMD/NVIDIA drivers on each platform.

 Windows 10 vs. Ubuntu Linux With Radeon / GeForce GPUs On The Latest 2018 Drivers