If you already have a working graphics card, then you can try to use it first. My last Nvidia card was 1070 and I just switched to AMD last year. And because my monitor is a little old, it has only G-Sync and no FreeSync; meaning I lost the ability of VRR. If you already have a monitor and gpu, then my recommendation is just to use that again and see how things are going before buying into new and expensive hardware. As a sidenote, I’m a huge emulation fan. And old consoles and arcades have weird sync-rates, in which case VRR like G-Sync is optimal. But thats just a sidenote.
You can also dual boot Windows and Linux, meaning you choose what operating system to run at boot time. Then you have a little backup on one side and can jump back if needed and the new experiment on the other side. I assume you will do something wrong and it might even require to reinstall Linux again, maybe not, but you should always be prepared for the worst case scenario.