Woo! That's a tempter!! :)
It's a very subtle difference for a listener but I'm guessing it affects your playing more... Subtle again, but one or other pickup gives the player more of an "ooh yeah, I'm sounding good!" - depending on what their tastes/preconceptions are.
I can hear how some folks would prefer the Mule, and others the Black Dog. I think I much prefer the Black Dog on the "rolled off" section - for ages I've been suspecting Mules of not giving me quite what I want in those circumstances, I find Riff Raffs the same in a different way (but I LOVE how the Stormies do it). I'm liking what I'm hearing here for rolled off on the Black Dogs.
On the louder section - I'm torn... There's an edge to the Mule (which I recognise from my uses of it) that is kinda what I love about it. The Black Dog hasn't got that quite so much - BUT it would probably be enough for my needs... And then it's got something else as well - it's filling that "gap" that I sometimes feel the Mule and Riff Raff are leaving on heavier sections (and this recording is roughly as heavy as I get).
Food for thought... very tempting... (I'd be thinking BD instead of the current RRs in my SG - and this clip, with my knowledge of Mule v RR, has turned out to be quite useful)
Sounds like the punt has worked out for you :)
Thanks for posting