This is a tough one, but I've got to go with GOT. If Infinity War and Endgame was all one movie, I might have gone with that. I was more excited to see Infinity War than I am Endgame. We all know the major characters coming back with the exception of maybe Tony or Cap. Infinity War was our first look at Thanos in action against all of the heroes.
But GOT?! That's a damn 8 hour sequel to seven 8-10 hour movies. Plus the stakes are higher and the mystery to the ending is greater than that in Endgame. Anybody and everybody can get it in GOT. And the battles and suspense in that shit going to be epic. This is Infinity War and Endgame for GOT. Hell this might be Civil War, Infinity War, and Endgame all rolled into one for GOT.
I'm taking GOT over Endgame all day.