For AMD users that wan't to change to Linux I would recommend the <span class="bold">Antergos distribution</span>
. The distribution was recommended to me by Judas 1 or 2 years ago but at that point the AMD graphical drivers (Catalyst/Crimson Software) weren't maintaned very well by AMD. But now there is very good support for AMD graphical cards in the form of by default installed MESA drivers.
Antergos is an Arch Linux based distribution that runs basically an up to date Linux kernel (4.11.2) and latest MESA graphical drivers (currently 17.1.0) and more or less all Linux games/ports will run on AMD cards on Linux. The distribution is very user friendly. It offers a choice of six desktops. For me the best is Cinammon which emulates old Windwos XP/7 desktop and as such is perfect for beginners. Otherwise its more less identical to other Linux distributions in handling it.
Currently I tested Company of Heroes 2, Cities: Skylines, Transport Fever and Realpolitiks. All run practically without a glitch. Occasionally a crash to destkop occurs on game startup but that is cause of occasional graphical driver instability.
Do gog games run on it? Yes.
As said I recommend the distribution to all AMD users since LTS versions of Mint and Ubuntu do not carry up to date drivers for AMD graphical cards.