I have an 09 wrx sedan. Its a fast car in a straight line but the handling was quite sloppy until you do some handling mods. I have only put in coilovers in for now and that has made it a lot more enjoyable. The brakes will definitely need upgrading if you're going to do any track work whatsoever. Not that i have done any but i have felt it fade just from going to the pwrx CM cruise.

IMO, go the sti. Don't get me wrong, the wrx is a nice car for a daily driver until you splash some coin on it of course.