I've been a PC user for over 20+ years and if I were on the market now I would go with an APPLE computer. Apple systems are designed for work, graphics, business and school work. PC's are great but they are falling short.
I recommend PC's if you want to learn about computers ect.. It's great for learning troubleshooting, configuration and things of that nature. It's impossible to become a great PC tech on a MAC. Hardly any issues to troubleshoot which is great for the average person but not people who want to master technology. All the crashes, bugs, malware, viruses and incompatibilities on PC are great for real world training : )
Before MAC's were at a disadvantage because they were using PPC processors and their system was mostly proprietary. Now that they use Intel i386 technology it can run both MAC and Windows. They are becoming more flexible in what is allowed on their systems.
MAC will give the option to become an iphone, ipad and platform developer. You will also have the option to use Windows and tap into that market as well. PC's can't run MAC OS natively but MAC's can now run Windows without issue.
Lastly, MAC is updated constantly : )
In the next 5 to 10 years hardly anyone will be using a desktop or laptop. Burners and discs will fade out because all will be replaced with cloud services, digital downloads and newer technology.
The majority will be mobile using phones, tablets and eye glasses with built in operating systems to connect to the net. Techs won't be needed as much because systems will be designed to self heal with backup restore images and such. Furthermore, cars are now adapting Internet access on a greater scale. Even low end cars will have some sort of net access in the near future.