This is stupid. It doesn't matter what it writes on top of what you're buying. I buy parts, not brands.
Yes, AMD does offer the best P/P, which is why I also find myself suggesting them more. That said though, nVidia is more reliable on drivers and if you want "the" best, then the 580 is currently that card.
Still, if you can find reference 6950/6970's, they indeed are a better option for most users. They have Volterra Digital PWM's, more vRAM, better scaling and such. Shame that it's hard to find reference anymore. XFX for example changed their design to V2 under their 6970. Diamond's 6970 is reference and is a great GPU.
I wouldn't exaclty call it stupid - it's simply a matter of personal preference. After spending the $400-$500 on a VooDoo years ago (the equivalent of today's $800-$900), then having nVidia buy out 3DFX and completely dropping support of the cards only a few months later (and refuse to release any new drivers) . . . coupled with the support headaches I've run into with a few of my father's cards . . . add in how draconian they are with some of their hardware compatibilities, and I simply won't support the company.
Much like how there's countless users out there who don't want to purchase Creative hardware, or people who won't support this product or that.
Personal preference isn't dumb, everyone has their prefered brands and equipment - some stick to specific hardware brans because of the reliability, some because of price, some because of ease of use or whatever.
Regarding the drivers - years ago it was the other way around. ATI's drivers were much more reliable (not sure what the hell has happened to them over the last year or so), and they were also released around the same time every month. nVidia has gotten better about more scheduled releases, and access to betas, and their reliability has improved . . . but it still hasn't changed my opinion of them. I'm willing to recommend their stuff if I feel it's beneficial to someone based on their needs, but that's the extent of it.
I suggest that if you view hardware as a monotheistic choice, then you oughta see a head doctor
Or go visit Apple's Genius Bar and see what dark places it can lead to.
You funnah trollin - you know how we all roll around here