I'm using Orion on iOS which has native ad blocking and supports a good number of Chrome and Firefox extensions. Even without uBO I have a virtually ad-free experience.
I’m super impressed with orion as well. I use an iPad and Orion provides a decent support (still a WIP though) for Firefox/chrome desktop extensions to run in iOS. After Reddit axed third party support, I almost stopped browsing Reddit until I found out I can run RES with old.reddit inside Orion. This has been an absolute game changer for me.
Again: every browser on iOS is a Safari reskin because it cannot be otherwise. Safari and WebKit are essentially the same thing (download WebKit on Mac to find out)
Only “remote browsers” like Opera Mini can currently use something other than the system’s webview.
More specifically it uses WKWebView. You can’t compile WebKit yourself to include in an app, which means less flexibility than non-iOS WebKit apps and Chromium forks. Their complaint is valid (“reskinned safari” is just a casual way of saying this)