Macs trade versatility for reliability, efficiency, and good-looking-ness.
While PC on the other hand, gives more power for less dollar with more software choice.
As for crashing, from my experience, Mac definitely crashes much less than PC. by crashing, i don't mean certain software crashing, because those softwares are always made by 3rd party, so it's not really apple or microsoft's fault. I mean the operating system crashing, PC far more than Mac.
It's understandable too, since Windows has to be able to run on all sorts of machines, while Mac are customized to work perfectly with the very limited number of machines apple sells.
There is nothing one can do that the other can't.
You can buy good monitors, towers, and install themes, as well as add-ons to make your PC look as good as Mac's interface, but Mac comes with all those built in, and it just works. And sure you can tweak your setttings to make it more secure and reliable, but the tweaking itself means more work.
As for Macs, you can also customize your Mac to be as powerful as a PC, but at extra cost, and unless you've a mac Pro, it's a pain to upgrade, change harddrive, add ram, and what not. There is a Mac replacement to just about any windows software, but most softwares comes out for PC a few months before Mac. Sure it's there, but it means extra waiting.
As for Apple likes over simplification. It's a perspective thing. When graphical user interface first came out, the command line loving geeks called it over-simplification, appealing only to the most basic users, and look what it has grown to now. It's like if you want to drive manual or automatic. Manual gives better acceleration, better fuel economy, and tends to be cheaper, but most cars on the roads are automatic anyway. It's just all about being user-friendly.
In regard toFCP X, i agree, it definitely does not satisfy the need of professionals now. But it's paving the way. But an analogy would be that, everyone wanted a faster horse, but apple hit you with a car. Now this is not a modern sport car apple hit you with, but an old 17th century steam powered vehical. It's not faster than horses, it over heats, there's no road for it to run on, but it's still a car. In due course, it will replace horses, but for now, all it has is a lot of potential.
The two systems are really just a matter of personal preferences.
Some people want to be able to change their system to exactly how they want it to be, while others, such as myself, would rather spend more money, and not worry about the technical aspect of things and just get creative.
As for the really, really proffessionals, there's no difference. Some of them want to customize their work flow so perfectly that they invest in their own linux based operating system, while others want something that's familiar and just works, in which case they have spec-ed out mac pros.
I don't see how one is any better than another. All i see is how one is better suited than another for any one individual.