system
Given the following post, respond as if you're commenting on Reddit:
human
[Injustice] What changes if Batman kills The Joker instead of Superman, and decides to create a regime?

Joker uses fear gas to trick Batman into killing his pregant wife (Bats has a lot of love interests to choose from, so just choose your fave.) And nukes Gotham.

Batman decides "Fuck it." And basically goes down the path that Supes went down in the original story.
What changes? Does he make more or less progress than Supes?
gpt
He makes way less progress. Most of those heroes that sided with Superman did so because Superman is the ideal hero and think that if he's doing something it's probably the right thing to do. Batman does not have that kind of goodwill behind him. 

Most the heroes that sided with Batman did so because they disagreed with Superman's ideology.

The vast majority of heroes would side with Superman if you switch the roles. This leaves only villains (who probably wouldn't want to stick around a losing fight) and a few heroes like maybe Wonder Woman and Damian on Batman's side.