I bought an AMD GPU before and the experience was so horrible that it's deterred me from ever buying one again.
I never knew how good I had it with Nvidia until I tried AMD. The main issue? Drivers. AMDs drivers were abysmally shit. I never had to 'choose' specific versions of Nvidia drivers to get them to work. I did with AMD, and some features would work while others would break depending on the version.
Ended up returning it because it was that bad.
Both. The experience was horrible on both.