Lane's correct, "best" is relative, but something else to consider is that there's a heavy rear weight bias in the AA2. So you can get whatever you want for he fronts but the rears do just about as much work as the fronts in my experience.
That said, if you swap compounds you should check and/or tweek the front-to-rear bias. Even between production lots of pads I've observed different friction levels. I had to tune them for track level effort and "for street." It's stupendously uncool when a the rears warm up faster and you can lock up the rears before the fronts when trail braking at the track...
Brammo shipped the wilwood BP-20 compound with my calipers. I tried BP-10 for the flatter torque curve, but they dusted quite a bit and squealed under light pedal pressure on the street. I've since gone back to BP-20s which are now almost shot. After that I've got a set of the "polymatrix Q" which will be my 4th set of front pads I'm already on my 4th set of rears. Whatever you choose they should last you a long long time.
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