Being an AMD fan myself, I couldn't resist responding...
I prefer AMD over Intel and I have for years. Aside from the "Megahertz Myth" facts that make AMD generally (NOT always!) perform faster than Intel, AMD is cheaper - sometimes a lot cheaper.
For me, it has been simple experience. Your mileage will vary! :P I currently have 2 setups, almost identical - both with Radeon 8500 128mb cards (BTW, I hate this card), both with Asus boards, 1gb of RAM... 1 is an AMD 2600, running at approx 1.98 Ghz (Barton core). Why does this system routinely outperform my P4 2.8 Ghz? /shrug... OS is the same (WinXP Pro).
I am running a variety of chips in the rest of my network equip. My firewall is an Intel Pent 233, but my Web and Mail servers are AMD 300's. My PDC is an AMD Athlon 900, but my BDC is an Intel Pent2 333.
My EQEmu server is an AMD 2400, though! :P~
Personally, I have to salute AMD - they have come a long way in a market that was initially against them and are quite competitive with Intel. Aside from a rather serious timing issue years ago with Win95 and the AMD 350+ (anyone but me remember that?) every chip I have used from AMD has been rock solid.
In closing, this is all just IMHO... Your mileage may vary!
~Gandar