Mm... On his best days... Is basically an abstract...
Dr strange at his best could potentially beat mm... Because strange at his best harnesses the help of abstracts like eternity, lord chaos, and master order...
But what dr strange would have to cast a spell to do in seconds... Mm dies as a thought...
Dr strange can be potentially stronger... But he's not an avatar like spectre... He uses spells... And mm can defeat stephen with a thought before strange can speak a word.