Intel is based America
AMD is based in Germany / Europe
The efficiency and resourcefulness of the processors they design is representative of their countries of origin... economically speaking.
Intel is likely cheaper to get in America, like AMD is cheaper to get in Germany / Europe for shipping reasons.
Shop owners may want to push 'the local product' for their own economies, etc.
There is less AMD in the world, and people fear them because of that.... their loss, leave AMD to the techs who know better IMHO.
About half my PCs over the last 10 years have been Intel based, and about half AMD... a very small percentage where neither (IBM / Cyrix, etc). Both platforms are highly compatible with each other, only power consumption and performance tend to differ noticably. Each have similar problems aswell, although very minor as they are. (eg: Norton Ghost and platform IDE chipset support, minor bugs in the CPUs on both sides, etc). However because of my current system more of my processor cores have been AMD... but only just.
Go for whomever provides the most cost effective solution, they are each easy to build from parts... you may want to factor the power usage in (ongoing cost), or you may just look at initial purchase cost instead.
There are many people out there who have never installed a platform chipset driver, and because of this AMD 'appear buggy' to them, when it is actually the tech who is totally clueless to industry standard procedures and building dodgy systems by just slamming an OS + software on after building the box.
System building is as much of an art form as it is technical in nature, and there are many thousands, or even millions+ of 'ugly' configs / setups on PC rigs out there.