I actually liked when chrome tabs showed up in the app switcher... I don't like FF much at all, but I at least get ublock on it. So FF is my default (so launches from twitter/fb go there), but the sites I go to directly, usually done in Chrome.
The main one is simple but effective bottom navigation functions and quick access bookmarks. Stretching up to reach the navigation bar on a large phone is almost impossible one handed in chrome but easy with the Samsung browser.