NVIDIA 375.10 vs. Linux 4.8 + Mesa 13.1-dev AMD GPU Benchmarks
Dota 2 at 1080p with OpenGL shows the cards being CPU bound while the NVIDIA driver manages to achieve a higher frame-rate than RadeonSI.
An interesting race.
Unfortunately for today's Vulkan tests, they are NVIDIA-only since the Padoka PPA packages with Mesa Git + LLVM Git led to a broken state for RADV with Radeon Vulkan.