That all depends on the "profession" you are working in. You should pick the one that matches what the others use in your profession as it will make life a lot easier. If you're in the advertising, graphics, visual arts (TV, movies...), games, some education and publishing... Then most likely the Mac is your choice. Otherwise, PC dominates overwhelmingly. They are both easy to use. But there are many times more software available for the PC, but which you may not want to buy anyway.
So it is best to ask your colleagues before you plunge in.
So it is best to ask your colleagues before you plunge in.