Gorr vs Ego:
Ego takes it. Like, Gorr is powerful, but note that his most effective battles against Thor and company occurred in the shadow realm, where he was explicitly powered up beyond the normal. Outside it? Honestly, I got the impression he was at *most* equally powerful to post-EG Thor, and likely not even that. Which is still "Hope I don't come to your planet with ill intent" level powerful, yes, but its not exactly omnipotence.
Whereas Ego? Is really really frickin' powerful. His defeat required:
-A "moonbusting" weapon delivered to his brain core
-The Guardians being *allowed* to get most of the way to the brain core in the first place
-A giant distracting space battle occurring inside his structure
-And most importantly, someone able to directly contest Ego for control of Ego's own cosmic power
Gorr is powerful, but he's not going to have any of those free advantages. And I'm rather dubious of him being able to shadow teleport straight to the well-lit brain core. Ego is going to have nothing distracting him from just focusing the full brunt of his power on Gorr, and that is that.