The 1's are the most neutral sounding of the Blackouts, if there is such a thing. They feel like strong passives through an onboard preamp, but still react like good passives should. Both pickups clean up reasonably well and the bridge has no major humps in the EQ, just a soft upward curve at both the low and high end. The 1 set can cover a ridiculous amount of sonic territory with the right rig.
The 2 sounds great in the bridge and can really thicken up a thin-sounding guitar, but doesn't really have the midrange clarity of the others (though I wouldn't go so far as to call it muddy, either). Leads sound great when you're playing at home and chords feel absolutely huge and driving, but the tone of the 2 can't hold up to a busy mix as easy as the 1 and 3. Its primary focus is clearly heavy rock and metal rhythms with soloing ability only a secondary consideration. I will say, on the lower output jumper setting you can *almost* experience undistorted cleans...almost.
The 3 is nearly as versatile as the 1 and very similar in some ways, but it is brighter and lacks some of the warmth and flex that the AHB1 set has. It's articulation is unmatched in the Blackouts series and you can really get the 3's to sing when you dig in, but there's something about them that wore on me after a while and I'm pretty sure it was the unforgiving stiffness. Definitely a close contender to the 1 on most fronts and an ideal solution if the 1 set comes off boomy in your axe, but still just a close second in my opinion.
Don't forget that you can also use the neck models from the 1 and 3 sets in the bridge position, much as players do with EMG 85s and 60s, for even more tonal versatility. I think the 5 different models (1b/1n, 2b, 3b/3n) offer a practically unlimited palette of tones from which you can craft almost any sound.
I hope that makes sense...I'm half asleep typing this