Hello MT. I see you there, my doppelganger.
The Dark Knight. Easy. Captain Marvel was good. The Dark Knight was fucking incredible.
Avengers Infinity War. Little closer but Infinity War is just better.
Winter Soldier. Now this SERIOUSLY gave me pause. I still haven't made my mind up completely but honestly, Winter Solider is a fucking fantastic movie. For me it was the point where the MCU said hey, we can do more than typical capeshit. This movie was a sort of political thriller kind of movie hiding as a superhero movie.
Spider-Man Homecoming. Spider-Man enters the MCU with a bang. Guardians goes for a not as good second outing (I did still love it though and I give them fucking tons of points for taking on something as fucking weird as Ego and nailing it).