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But I can see myself mixed about the dual with Mannimarco vs Mankar. For starters, it boils down to lore and earlier games vs what we experienced in Oblivion.. the later was far from impressive. Yea granted he held power that rivaled the greatest powers of the Mage's Guild at the time, I somehow cannot see him the same as some mighty lich king of ultimate power..
As for lore.. he's a monster.. simple as that. Not only is he powerful to make any mortal flinch just from his name, he had the cunning and intellect to see to his desires.

As for Mankar.. well for starters they would clearly not be playing in a field that favors one. Mankar has his paradise, granted he had to borrow power that was not his. On an even field, his only possible advantage is Dagon and his knowledge.. but that's sadly not much.. Dagon for one saw him more of a puppet, and surely would of discarded him the moment he served his use. As for the knowledge, it's hard to say how much may be true or how helpful it can be... aside from aiding in a full scale invasion from oblivion.. Still, he is dependent. While Mannimarco may indeed rely on his hordes, he himself has the power to subdue them. +1 Mannimarco
Now if we threw Sotha Sil into the picture... eh..

Dagoth is by all means powerful, he is very much more powerful than the Tribunals.. but he is still a mortal god. The Heart that empowers him is vastly great, especially seeing as his nature flows along the same as teh heart, rather than against He had godly powers compared to few that could match, an unlimited supply of energy, and the means to bring about powerful divine curses and havoc indirectly. Simple to say, his main weakness is indeed the Heart of Lorkhan.

As for Miraak, he was wise and powerful, same old story right? What about being the first dragonborn, few can boast that. He held the power of many shouts and was a threat to even his former masters. He may have been powerful and a force to fear, but that doesn't mean he can't be taken down. Then we have Mora.. who saved him from fate and offered him servitude. He had access to untold secrets and knowledge, something that in itself was power. He may have grown bored reading so much.. but he certainly would know the answers to many questions. Thus is this, he had gain powers unique to dragonborns that made him even far more of a threat, coupled with Mora's influence, we can be glad he was kept in oblivion for so long. In game refered to the the PC as being so powerful as the dragonborn, he was near demi-god, possible more powerful than Peryite.. and we all should know just how powerful the Princes are.
The thing is, Miraak at first was more powerful than he, mocking him at that and displaying his command over even the souls of dragons. Draws to question, just how empowered was he?

I can personally say Miraak has my vote. The two by far are very powerful, but ultimate control over wills kind of tops mere mind manipulations. Aside from that, the Heart was a massive factor, but I would not be surprised if Miraak somehow learned how to undermine it.. bc of secrets and all.. Sad to say, but unlimited power doesn't always mean better.. you need to know how to use it too