The same open source Radeon drivers that have dropped support for my netbook APU, downgraded to GL3.3 from GL 4.1 without hardware video decoding as previously provided by fglrx, while the Windows 8 drivers keep providing GL 4.1, DirectX 11 and hardware video decoding on Windows 10, on the same hardware.
I've had presentations where the Macbook couldn't sync and the Kubuntu Dell rescued me. Linux video is massively better than a few years ago thanks to AMD drivers being fully open source.