Thought I put my opinion earlier but oh well, I guess the system glitched.
On a completely biased and personal note I would say Umr at-Tawil/Yog Sothoth over The Presence because I actually get the sense that this entity is truly omniscient and omniprescent, probably because Lovecraft actually did a good job conveying the magnitutde of this massive entity which is no easy task. Yog Sothoth encompasses everything from the smallest of atoms or elections entirety of the Multiverse and Space-Time, all are one within Yog Sothoth and literally everything is merely a facet of him. Every concept, every world, every thought, every battle, it's all a war within this Entity. And so because of this, outsmarting or outmatching this opponenent would be completely impossible because you're a part of its Dominion, its Ebb and Flow.
The Presence is extremely powerful, and I mean extremely powerful, but to this day I see little proof that the guy was ever supposed to be omniscient or omnipresent given how even he admits he doesn't know everything. If he's being hoenst then Umr most definitly takes it, if not and he's lying then the they're either at a stalemate or the Presence can best this aspect of Yog Sothoth. I guess?
While neither is above talking to tiny, petty, little insignificant mortals akin to fleas, I always got the sense Presence had more in stake during the situation whereas Yog Sothoth is just behaving by his Alien nature/ Plus Yog Sothoth never needed to be replaced unlike the Presence. Btw I'm more then willing to admit that I'm wrong but I'm just having spit-balling ideas here. I just feel like Yog Sothoth felt more like an entity that truly elevated his status and if taken to the extreme, if the Presence was having some sort of beef with Lucifer/Samael, by decree of who and what Yog Sothoth is, he'd encompass both the Presence and Lucifer and more being the Ultimate Archetype.
On a more serious note, I'd say it would have to be a stalemate if I was being serious. But IMO it's Umr.
