To me it is simple. You look at reviews, see price, see performance and then make a decision on whether to go for an AMD or Nvidia card. Say as an example the nvidia card is 100% performance and costs £400 and the AMD card is £350 and offers around 95% the performance of the nvidia card. I would go for the AMD card, where I was happy with the day 1 performance for the price.
If later on AMD through drivers managed to get to 110% performance beating the nvidia card after 2 years, that I would see as a nice bonus. End of the day I get 100% of the performance I paid for on day one with the AMD card, as that was what the performance was when I agreed to buy it after looking at reviews.
Now say if nvidia card offers 100% performance and an amd card offers around 95% performance, but they are both priced £400, then I would go Nvidia as I would rather have the 100% performance I paid for from day one rather than waiting 2 years for the AMD card to catch up or get better. Basically I want what I paid for, I want price for performance day 1.
The point is, historically from what I recall when AMD had the slightly inferior performing card, but they usually priced it cheaper. Therefore you got better price for performance and on top of that you ended up with a better card after a couple years anyway. Hence it was a win win, unless you were happy to pay the extra money to have the extra performance from day one. But you had to pay more. That is why I had a lot of AMD cards as to me extra few percent performance from day one was not a big deal and I preferred better price for performance, therefor I had AMD cards nearly exclusively for about a decade as every time I did the numbers AMD had better price for performance for the performance I needed/wanted at the time.
These days AMD cannot even offer the performance I even want, so they are not even in the game unfortunately. Not only that, but they are also not the price for performance kings they used to be, which was one of the reasons I really liked them. Hopefully they can catch back up in the next 2-3 years so we can have a competitive market where we see our money buying more performance due to competition rather than lining nvidia shareholders pockets.