Whats better a Macbook Pro or a Macbook air?

[Zoe]

I want to save up some money for a laptop and Ii figured if I'm going to spend a lot of money I would like something that would last a long time. I already did my own research and it says it depends what you want to use it for. I probably won't do my school on it and if I do it's to write papers and stuff. Also, the website I most commonly go on are facebook, twitter, and youtube. So which one would you recommend and why? Thanks in advance!