If you take it on face value the PC would be the obvious choice as it is cheaper to buy a fast PC and a lot of apps are available on both Mac and Windows.
The thing people often overlook however is what the computer would be used for when not running professional applications - i.e. your daily 'stuff'. Yes you need to know which apps you will be using but you need to pay attention to the way you work. OS X will suit some people, Windows and Linux would be better for others. Personally I prefer OS X, it has become second nature and I now feel Microsoft have lost their way - I've used every flavour of Windows since version 1.0 and the latest release is a mess. I like Linux as a server platform but I'm not a big fan of any of the current window managers - Unity and Gnome 3 feel very counter intuitive and I've never liked KDE.
I feel for those buying a new computer choosing the right platform is just as important as choosing the right applications. You can't hide from the OS even if you are running on a tablet so it had better be good.
The thing people often overlook however is what the computer would be used for when not running professional applications - i.e. your daily 'stuff'. Yes you need to know which apps you will be using but you need to pay attention to the way you work. OS X will suit some people, Windows and Linux would be better for others. Personally I prefer OS X, it has become second nature and I now feel Microsoft have lost their way - I've used every flavour of Windows since version 1.0 and the latest release is a mess. I like Linux as a server platform but I'm not a big fan of any of the current window managers - Unity and Gnome 3 feel very counter intuitive and I've never liked KDE.
I feel for those buying a new computer choosing the right platform is just as important as choosing the right applications. You can't hide from the OS even if you are running on a tablet so it had better be good.