To be aligned to one company is foolish, and yea its a fanboys thing, get what you believe to be the best, be scientific and read all about the details of both company cards, they are both excellent, x800s or 6800s or 7800s, whatever, those who restrict themselves to one company are foolish, and its a FACT that one year one company is better than the other and next year visa versa.
I buy both AMD and Intel cpu s / pc s , at the moment its AMD, l see it being AMD for some time with 64 bit comming n all, but you never know, then when the x800 range was first released NOTHING could even come close, not even the 6800 was out at that stage, now nvidia have released the 7800gtx and by poojabber its better than my x800xt or pro or xtpe. fact.
So l have two on order for my new duel core cpu AMD because l believe its better than a twin xeon Intel system.....
AMD duel core at 2.4 each...
Intel xeon at 3.6 each...
Be smart people and dont fall for company bs and hype, they are LIERS , fact, trust yourself or trust a site like Anandtech for some open unbiased veiws but keep in mind you will always get bias fanboy views too. It aint to hard to tell.