>>11976798 (OP)
I mean you would have to be a hell of a lot more specific than that. The "most popular" is whatever was in the best selling pre-builds. For the nerds out there it wasn't uncommon to have multiple cards you would swap out because some games likes some cards more than others. By the late 90's that was mostly dead and it turned into ATi vs. Nvidia where neither was really better than the other. But Nvidia (almost) always was the superior and more expensive option on the high end, mid range is a shit flinging match where nothing mattered and everything sucked ass for decades, it wasn't until about 2010 that there was half decent midrange cards.
Now the dark depths of the bottom of the barrel cards are something to behold, I'm talking full slot cards that still manage to be shittier than on board graphics, cards that look more like a cheap wifi card than a GPU, these things are something to behold the monstrosities these companies managed to put out for an MSRP of $20 that's only purpose seemed to be "let the PC boot". Yet those same cards were found in the cheapest bottom of the barrel compaqs, HP, or dells you can find and boy are they stinky.