They are by far the bigger company for GPUs (80% vs 20% or worse for AMD), and they do polish their drivers more before a release. On the other hand with a 80% marketshare, they do have to compete with themselves for new sales. That doesn't necessarily mean building in some planned obsolescence but it can be a factor. Certain of Nvidia's generations mainly aged badly because they skimped on VRAM or bandwidth, but while 16GB on the 6800 and 12GB on the 6700 was more generous on the AMD side (and 8GB on the 3070 and 10GB on the 3080 was far less so), against that this gen AMD really went low(er) bus-width and VRAM on the 6600 and 6500s.
With an 80% marketshare and more game sponsorships, Nvidia are also more likely to have release day drivers - despite the consoles. Sponsorship and pushing certain techs have used and abused to distort the market for years though.
Have to say that the Nvidia control panels are pretty poor compared to AMD ones though.
With cards now undervolting is really good
With Nvidia have to use something like msi afterburner with AMD can do it all in it's own panel just makes the experience better would have thought Nvidia would have added that by now