Which Macbook should I choose?

So I am currently looking into becoming a student in Amsterdam at the Film Academy. It is my goal to become a screenwriter, and since my current Acer notebook manages to disappoint me often lately, I thought it would be time to choose a new notebook. Since I have been using Apple products with joy the last few years, I have decided that my next notebook should be a Macbook.

The problem, however, is the choice between the Macbook Air and the Macbook Pro.

Since I am going to be a screenwriter, the Pages app should actually suffice. In my first year, however, I also have to work with video and sound editing programms. So which Macbook suits me the best? And should I wait until the next generation of Macbooks? I'm currently considering the Macbook Air but I really would like to hear your opinion about this.