I enjoyed that brief Android Chrome experiment where the browser supported moving the address bar to the bottom. Now that feature has been made available on iOS, but remains AWOL on Android.
In fact, Chrome on iOS is Safari. The same applies to Firefox.
Apple doesn't allow apps to parse JavaScript arbitrarily, so browsers are just a Safari WebView with whatever UI and tracking they want to add on top.
The exception being one weird browser I can't recall the name of that actually renders everything remotely and just streams the final contents to the iOS client, but that's a bizarre approach.
I don’t know the full details, but I’ve read that Apple may be dropping the requirement to use WebKit within third party browsers in the near future. Something to look forward to.