Ego vs Dr Strange:
Hmm. This hinges on a lot of unknowns, mainly "can Ego uses his cosmic energy to interfere with Strange's more esoteric magical powers, like portals and dimension shifts"? Which, given the scale Ego operates at, he *probably* should be able to do, but its not certain.
I'd call it 7/10 in Ego's favor, since while there are a lot of unknowns, Ego ultimately does benefit from being a planet sized being with a moon sized brain. That gives him a lot more leeway in making mistakes versus someone with a squishy human body. Plus, Ego isn't distracted like he was in GOTG 2, its just him versus one ( scarily powerful ) foe.