The OS is so much better because Apple controls the entire process - they don't just make software (a la Microsoft) they make hardware and software the whole kit-n-caboodle.
The problem with this argument is that if Microsoft attempeted something similar Apple users would cry foul - that it would be unfair for the monopoly microsoft to further enhance their monopoly. Nevermind the government intervention.
In one of the comments to the article someone talks about how great it would be if Apple ported OSX to the x86 processors - and that all sorts of windows people (who are unwilling to switch hardware) would flock to the new OS. This makes no sense to me. The ambiguity of PC hardware is one of the plusses. I can use a Dell, or a Gateway or a HP/Compaq, or a home-made box, and they will all run windows the hardware doesn't matter. I don't see people taking the time/trouble to change to OSX for the PC just 'cause they get to keep their current box it just doesn't make sense. The other problem with that suggestion is that Apple would have to give up the control they have over the hardware of the system, the intergrity and greatness on which their OS is built, it just isn't feasible from Apple's perspective. Maybe I'm missing part of that argument, but...
Another common argument is that PC users have always used PC's and are just too unwilling to switch - sort of a your father's computer argument. I must say that unless things have changed significantly since I was in school (elementary-high school) almost everyone in the US is exposed to the Mac for at least 4 years. That was all we had when I was in school. We even had a programming class that ran on the Macs running virtualPC - or whatever it's called (damn was that god awful). So my dislike for the Mac stems largly from my use of them. To me they feel like a toy (and if you know me you know I'm all about new electronic toys) - but this is a little child's toy they seem that if you try to do too much on them you will break them - and I have - I can't count the number of times the whole system has just died. I'll give you that I haven't used OSX to any extent, but all of the previous versions of the Mac OS that I was exposed too were much shakier than Win95 and even Win3.1 in many cases.
The other main reason that I use a PC is - that's what nearly 90% of the rest of the computing world uses - so you do the math. If I am given a laptop at work - at the largest management consulting firm in the world, imagine what kind of laptop it is - yep a PC (Compaq, to Dell, to Toshiba again the beauty of ambiguity of hardware the firm can shop around between vendors for the bests deal, and still be assured that their software will work). Even if I worked at a more traditional position, where I went to the same office/cube every day - the computer on my desk would be a PC. At my current client engagement we are provided desktops by the client - guess what they're PC's (Dells to be specific). To me it just doesn't make sense to have two completely different systems at home vs. at work. It would just be too much effort to think about where you were and what system you were using. I remeber that frustration in high school.
The beauty part of the whole thing is that it doesn't much matter which platform you like. For the most part, with networking standards, and the internet most applications are platform independent (at least on some level). It's very easy to integrate a Mac into a PC network, and vice-versa. So go with what you like, but for God sake don't go around telling me how much better your mac is than my PC - cause you're wrong my PC is far superior. :-P