Admittedly, yes, I am probably dead set on Nvidia. But that's essentially all I've ever owned. I've been very close a couple of times at picking up an AMD card, but just haven't.
Well, I can tell you from experience that the brand of your video card doesn't make that much difference when it comes to your experience. I've had ATi/AMD and nVidia but I've also had card brands that you've never heard of like Matrox, CirrusLogic and Oak Technologies. They all do the same thing in the way that all PC parts of a type do the same thing.
The difference between a Radeon and a GeForce card is like the difference between a Ryzen and a Core CPU. They're not exactly alike but you're really splitting hairs when trying to tell them apart. I saw a Daniel Owen video that was comparing DLSS 2.0 to FSR 2.0 in the game
God of War and the only difference that he could find was how the mist of Kratos' breath looked as it passed over his beard. I ask you, who the hell is going to notice THAT when playing a game? When they have to look at things like that for a difference, it means that there is no difference. The two videos side by side were indistinguishable to me (and I'm sure everyone else too) even though I had his video cranked up to 2160p on my 4K display:
Here's a little thought experiment...
1.) Ask yourself "What CPU and GPU does my phone have?"
2.) Then ask yourself "What CPU and GPU did my previous phones have?"
You probably have no idea (I know that I don't). It could be a Qualcomm CPU and Adreno GPU or it could be a Cortex CPU with an Imagination GPU or vise-versa. The chipset could be the Snapdragon platform or it may be by Exynos. PC parts, just like SmartPhone parts are just computer parts that all do the same things. If you didn't know what you had when you bought it, you wouldn't know from using it.
Now I'm not saying to buy one or the other, that's up to you. I'm just giving you a pearl of wisdom from someone who has been building and gaming on PCs since before nVidia even existed. Daniel Owen wanted an RTX 3080 but gave up trying to get one and "took a chance" on an RX 6800 XT. His hand was forced by the fact that the RTX 3080 was $500 more at the time. Here's his thoughts on it:
Here's his separate full review of the RX 6800 XT:
Again, this is just to explain that while the differences between the two manufacturers are hyped up by the "Tech Press", in reality, the differences are actually insignificant. Don't ever be afraid of a red box because it will work just fine. Now, for your (extremely) high-end desires, sure, only nVidia will satisfy them at the moment but "at the moment" is key. In another generation or two, Radeons will have RT performance that matches or exceeds the RTX 4090. At that point, don't be afraid of Radeon because you will get more for your money.