See, I don't really see them as the same market at all. Or, at least, once I got familiar with the Fenders, I didn't.
A PRS HB2 Piezo is a normal electric guitar with added acoustic sounds - not the best available acoustic sounds, but well within the range of normal, not worse to my ears than your typical piezo'd acoustic (which is to say, not as good as the better dual-system acoustic setups with an imaging pedal). The Acoustasonics put all that imaging software in the guitar so they are acoustic stage guitars with exceptional onstage acoustic sounds out of the box and ... somewhat limited electric sounds since they don't necessarily play with amps or pedals that well.
So I see the HB2P as an electric guitar for a player who also wants to be able to play some acoustic tones, and the Acoustasonic for an a plugged-in acoustic player who wants to be able to play a few electric tones.
That being said, the friend of mine who has an acoustasonic tele LOVES it. I'm not slamming them at all.