Not really, and thanks to iOS browser extensions (exclusive to Safari because apple), the few additions other browsers had are now avaliable on Safari.
It's best to use Safari anyway because close to everyone on iOS uses it. This makes it harder to fingerprint someone, because they all have the same general browser ID.
I'd follow the Privacy Guides safari config. It hardens Safari and adds the best privacy extension to block ads and tracking. It's the best for iOS private browsing right now.
This isn't allowing non-webkit browsers, it's just Mozilla saying they'll make a sideloaded version if they can. Unfortunately, iOS 17 didn't add sideloading, and it looks like Apple is programming iPhones to explicitly restrict it to the European Union :(
Firefox Focus is set as my default browser so that if I click on random links from Lemmy, email, etc. the session is disposed immediately. (I had a bad habit of ‘collecting’ hundreds of tabs before Firefox Focus)
I have a few things bookmarked in Safari, which still gets the protection of the Firefox Focus blockers. Safari is what I use for my self-hosted services.
I use Orion on iOS which actually does support both firefox and chrome extensions (though very much a work in progress compared to the mac OS version). Ublock origin doesn't work unfortunately but the built in content blocker is pretty much just as good. Orion is noticeably snappier to load pages than Safari (I guess because it doesn't have Apple's telemetry?), blocks all youtube ads, and can use Kagi as the default search engine. Just because every browser on iOS has to use the same rendering engine doesn't mean they don't come with their own features or perform the same in terms of speed.
OTOH with Safari you do get better extension support through the app store, can use iCloud private relay, and is theoretically better in terms of fingerprinting.
I recommend you take a look at privacytests.org for iOS browsers to get a better idea of what browsers block what. DuckDuckGo has the best test results in iOS as of this post.
Thanks. The issue I personally have with those tests is that they compare browsers using their default settings, which makes sense. It wouldn’t scalable to test every setting combination for every browser.
So I wonder how Safari would fare if it’s used exclusively in Private Mode with ad measurement and cross-site tracking disabled.