They are both good processor companys, thats why there are two, it matters what the computer is gonna be used for.
AMD: better for gaming, performance with real time gfx
Intel: multitasking, video encoding, high font/high text processesing
Intel is very popular in the server industry, they make some sick processors
AMD is very popular in gaming industry, they also make some nasty cpu's
I know if i was building an awesome server, i would choose Intel
If i was building the ultimate gaming rig, i would go for AMD/Nvidia
I have no doubt that AMD processors could be good for servers, or Intel for gaming , its just they are more in tune the other way around.
ofcourse this is all personal opinion.