In term of time to patch 0-day, Firefox is very quick to fix them (usually hours committed, days to publish). Chrome is quick too, so it's not a competitive advantage.

Most of cyber-criminals however, will target Chrome because it's way more used.

In term of control the password manager of firefox don't need you to have an account. That is very important because, you want to use a password manager on the web and to be able to actually trust it. Google can close you account without previous notice.