I've got multiple, but the best fight scene would be Captain America vs Winter Soldier from CA:TWS. The Knife fight was perfect.

And its for Shang-Chi, isn't it ?

Yes @Venom1502jw !

Black Panther vs Killmonger at the end of the movie.

Spider-Man V.S Mysterio! The visual choices for his spidey-senses were really stunning! Plus, I enjoy hallway fights so that's also another reason for me to choose!