mule is less powerful, warmer and cleaner than the others
top is chimey, but soft and not as bright as the riff raff
not as fat as some might expect from a true PAF (common misconception... real PAFs aren't fat and compressed sounding, unless they're heavily overwound)
the midrange isn't strong, but it's not midscooped like other PAF copies
think early zz top, paul kossoff, gary moore, slash
riff raff is pretty grunty and the mids are very transparent and balanced, with quite sparkly top and punchy low end
stiffer and more raw sounding than the mule
tonal references could be from early ufo, early ac/dc, black crowes to recent iced earth, stone temple pilots, some foo fighters and queens of the stone age stuff
most of the old school classic rock played with 60's and 70's gibsons and some modern players with classic stock gibsons
from the options, that would be the closest to the BB Pro, but sounds much more alive and clear
black dog is middier, darker, thicker, a bit more compressed, with tamed top end, like a punchier mule on heavy steroids, but still around vintage output level
the heavy overwinding and poly wire seem to deliver a lot of growly low and center mids, but not that kind of aggressive in your face sound like the hotter models like the nailbomb or holy diver
still retains a lot of the PAF tonal characteristics and output
I usually relate that to soundgarden, satriani, paul gilbert, some led zeppelin (I say 'some', cause lots of other stuff sound more mulish or riff raffish)
never played the abraxas, so I can't comment
but there's something about the 42 awg wire that I've never heard on hotter pickups
