Should I get a MacBook Air or Pro?

Ok so before school starts I need a laptop and I'm thinking of getting a MacBook but I don't know which one? I just need it to run programs like Microsoft office and a bunch of web browsing. Also I might do some light gaming like Minecraft or some Gmod. I was thinking of a MacBook Air because it is lighter and more portable between classes but a MacBook Pro is more powerful but heavier.

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