They’re all pretty good. Even the Intel cards are pretty good now. I guess, what’s most important to you? If you want maximum compatibility with games, go for Nvidia. If you want better price to performance, go with AMD or Intel. Although, if I were you, I’d wait until AMD and Intel’s next gen. Both are coming (relatively) soon (probably before the end of the year), and will probably be a lot better than what’s out now.
One caveat, if you use or plan to use Linux, Nvidia can present some difficulties, so avoid them.
Actually two caveats, if you plan to use hardware encoding, like you’ll be streaming on Twitch while you play games, avoid AMD. Their hardware encoding is pretty trash. Both Nvidia and Intel are much better.
My current lineup (I know I have a lot of machines, but my wife and I both play games, and I do AI workloads as well):
RTX 3090 (mostly for AI)
Radeon RX 6700 XT (great card)
Arc A380 (for transcoding, but I’ve gamed on it, and it’s great)
Radeon RX 6600 (my main card, just because it’s in my living room HTPC, running ChimeraOS)