Macbook air 13" or Macbook pro 13" Retina

Hello

I want you to ask which Macbook i should buy. Im a student and need the notebook mostly for surfing the web and write something for school. But sometimes I use it also for photoshop (once a month). So which one is the better decision?

The brand new Macbook air 13" with a 1,7 GHz Dual-Core Intel Core i7 processor
or the Macbook pro 13" Retina with a 2,5 GHz Dual-Core Intel Core i5 processor?

Thanks for the answers and sorry for my bad english

B... said:

They are both overkill. Pick the one you want. Do you want that retina screen?

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Hmm the retina display is a nice thing to have but i think on such a small display it isn't worth it. So the retina display isn't a big deal for me. But it might be handy when i work with Photoshop...