Neither. Legacy Internet Explorer 11.
Chrome is evil and Google sells your data for targeted ads. The browser is great but a) I am anti-everything Google, and b) I don't like how it takes your system (and IE) settings and uses those instead of its own in a lot of places (ie: proxy).
Firefox is huge and clunky, but it's my primary browser at work for ad-blocking and content-blocking extensions. Several popular sites look like shit in it, but for the other reasons above I still use it.
Edge is downright awful. Performance is the drizzling shits. Sites look proper in it, but it's slow as fuck. On dynamic-data-driven sites like Twitter or Facebook it has no chance. It sucks. And that's coming from the Microsoft guy.