Multiverse or not, the likelihood of Marvel's best taking on DC's best in a movie is pretty unlikely.
But that didn't stop YouTuber Alex Luthor from creating a fun video using clips from official movies and television shows of a bunch of heroes to make it look like they're in heated battle. Thor versus Superman, Green Arrow versus Hawkeye, Green Lantern versus Iron Man. It's the sort of epic hero battles that every comic book fan dreams of.
Also, seriously, who would win between Thor and Superman?