Either will get you there. I have both, both unpotted.
My SMs are in a Les Paul Traditional
My RRs are in a Faded SG
I personally lean towards the SMs - I have a new set on order for another SG that has Gibson 57 Classics in at the moment (they'll do it, as well, a very good job of it... but they're slightly mushier than the BKPs)
Of the two:
RRs give a harder sound. Bites nicely, can jingle as well, but I personally find them harder sounding.
SMs, in comparison, are much sweeter. They can bite as well, but I find them more versatile. And I love the neck pickup.
I play all sorts of stuff - blues/rock/pop/etc - my guitar sounds probably start in the 60s and end at 1980...
Stormy Mondays can do it ALL for me (including stuff I only used to use strats for). The Riff Raffs tend to push me towards 70s rock, so I pretty much only use that guitar for that kind of thing.
Having said all that, my gut feeling is that Riff Raffs would be your best bet. They've got more punch in the mid-range. The SMs aren't lacking at all, the RRs just have more of it. The reason I like the SMs is because I like to put the aggression in with my playing (I dig in a fair bit), I have to watch what I'm doing with the RRs and play a bit softer.
I had the impression that Harrison played softer than this, so the Riff Raffs would give a player like that the bite he got.