I've been getting more interested in the design element of Pathfinder recently, and am interested in taking a rookie crack at statting up the Archdevils. Before I go ahead with this, I was wondering if we had anything canonical (or close to it) mentioning their power relative to one-another? Historically, the level of hell they rule over has not been a good indicator of CR (which I like), so if there has been nothing official that states or implies their power levels, what would your opinions be?
For my own part, I am reading Belial and Mammon as pretty far down the rung. Geryon might be down their with them, or maybe a little higher.
Moloch, to me, seems somewhere in the mid or high range, but certainly not top dog. Dispater and Baalzebul seem like they'd both be CR 29 or 30 to me, and I get the impression that Mephistophelese is definitely up there. I love Barbatos, but I cannot for the life of me begin to guess at where he'd stand here. Thoughts?
I always felt that the deeper into the Pit you went, the stronger the archdevil became. That's because in older editions, they really did get tougher as you delved deeper. That said, I feel that the older archdevils are the mightier nowadays, so you're probably about right. Barbatos, being the enigma that he is, is likely pretty powerful as he's guarding the gates of Hell and Asmodeus doesn't need to be disturbed by every silly demon, protean, axiomite, or worst of all mortal adventurer who comes to Hell for some reason.