When Chrome started, it was the best because it introduced the process-partitioned model that allowed it to completely avoid a common failure-mode among its peer browsers at the time: one bug in the processing of one tab would crash the entire browser (a problem exacerbated by the existence of a now-defunct plugin ecosystem where third-party code was running inside the browser process; we basically don't do that anymore). That was becoming brutal on users as more and more of the work they did every day transitioned over to web-based.

The other browsers have picked up the partitioning since then as a feature so the playing-field is far more level.