Padomay or Anu would be the most powerful, for the Aedra and Daedra all came from them. They are the void, the space in between, and their realms encompass everything and nothing.
P.S. You could use a elder scroll to send a Daedric Prince of god ahead in time until they reach the time period when the world is destroyed. This worked for Alduin who was the Nordic minor god of destruction
I'm not even gonna bother. Read the lore. As for the scroll, doubt anyone knows how to do that anymore. I dont like Molag, but killing him aint gonna happen. Ever. Unless Alduin comes back and eats everything, lolz. But you can piss him off, and weaken his influence on Tamriel. Thats about it. Whoever thinks that you can kill him...You're dumb. I love the Aedra, mainly Shor, Talos, and Akatosh, but the most they could do if they actually did anything is cast them back to Oblivion. Between Aedra and Daedra, its kind of a dumb argument, since the Daedra cant defeat the Aedra in Aetherius or Nirn,and the Aedra cant even get to Oblivion.