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.

I think using Brave, just by virtue of ad blocking, probably isn’t worse than using Safari. I use Brave on iOS myself.

I use Firefox Focus instead of Firefox.

Its added benefits are it can also serve as some ad and tracker blocking for Safari browser as well.

I guess this this exactly what Apple thought when they implemented that BS policy. But yes, Brave blocks ads so you get some kind of extra protection.

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.

I knew someone who complilled chromuim for iOS but don't have a ton of information

firefox to use uBlock origin + a quick cookie toggle extension. You can't do that with Safari.