Who Really Won In Captain America: Civil War?

The first and most obvious answer to the question of who won is no one. Civil wars are nearly always a net negative. They take healthy, unified groups of people and pit them against each other, undermining alliances and creating rifts and bitterness that can be difficult to patch up. In the case of Civil War, in particular, things like the airport battle and Stark and Cap's scuffle in Siberia ensure that the team is deeply divided when the dust settles. The effects go beyond that, though. 

The entire plot of Infinity War would have likely been different if the group had been unified from the start. Instead, even when faced with a flying donut in the streets of New York City, Stark still hesitates to call Rogers out of hiding. Ultimately, he ends up flying off into space with Doctor Strange and Spider-Man, where he takes on Thanos with the Guardians of the Galaxy on Titan.

Back on Earth, meanwhile, Captain America is left with the splintered remains of the Avengers as they rally to protect Vision. This, of course, they fail to do. After Thanos crushes the team on Titan, he jaunts over to Wakanda, where he beats up the rest of the crew, plucks the Mind Stone out of Vision's head, and snaps his gauntleted fingers. While the events of Infinity War can't be exclusively attributed to those of Civil War, there's no doubt that one directly impacted the other.