I hear the issue of Nvidia Spitting out washed out and dull colours as opposed to AMD full spectrum colour is still around, its what's stopping me from going to team green. This issue was supposed to be resolved years ago with "True Colour" and DisplayPort", but I have found out (googled heh) that even now people can see worse colour even after fixing nvidia with 'full dynamic range' colour.
Try reviewing it differently by having 2 identical systems (AMD|Nvidia) with two separate monitors (10 bit IPS), put them side to side, then use an external camera to capture both. Don't use screen capture software. Then run again with an external calibration tool, then photo. Then check the photo in photoshop, comparing pixel on the left and pixel on the right.