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80% of a vehicles stopping power comes from the front brakes. Manufacturers compensate by having smaller rotors and single piston calipers in the rear to try to make braking loads even. Fronts wear faster but manufacturers try to engineer them to wear equally.
Always gonna be the fronts, but will be more noticeable up front depending on your driving style (more aggressive, if you do any AutoX or road racing, etc.).
Rears...if you do a lot of burnouts with no line lock. Found that one out the hard way...twice. Turns out one really....really long burn out can make your rear pads almost dissolve completely. Pretty cool if you think about it.