I loathe the new Safari “tabs”, with as much scare as you can get in those scare quotes. But, I still can’t leave Safari be, as I appreciate the history and Keychain sync with my iOS devices.
It’s that tight macOS/iOS integration that makes me stay on Safari, along with the relatively lighter energy usage versus Chrome. This looks nice in terms of using native UIKit elements (probably, it’s just screenshots) and probably the system WebKit, but I would really miss password syncing.
(Yes, I know, there are innumerable password sync options, but Keychain sync really does “just work” between iOS and Mac.)