The question is - how to compare processors? By price? By technical specifications?
I've been using AMD only since they made a processor which was good as Intel (and at that time it was faster in most operations) which was also a lot cheaper. If we did not have AMD and if we did not support AMD, Intel processors will never have today price tags.
(I've had Cyrix also, but for about a year)
From all these years using AMD's and by my personal experience, it is a myth that Intel is making better processors. I've had Intel processors in all my computer at various workplaces and when I come back home, 5 years older computer with AMD gives me an impression of a space ship. Of course, I am comparing processors by technical specifications only - number of cores, clock, etc.
Regarding SQL Server I am not sure either. My PC is now 6 or 7 years old and I can see how fast SQL Server is working here compared to the client computer (I am working using remote desktop in this case). The difference is not academic, but it is for a few times. What runs on my computer for 3 seconds I was seeing running on new computers with similar Intel processor for 10 seconds. Memory? I still have 4 GB, in today's standards, that is not enough. Perhaps it is anty-virus or slow disk, I do not know.
Somehow I feel more life with AMD, especially on multi-tasking where it is most visible.