The adblocking functionality isn’t as good as Adguard for Safari for iOS or uBlock origin in Firefox. Because of that some ads tend to leak through or lead to redirects when AdGuard for iOS would prevent it. Same with uBlock origin on Firefox desktop even if I have the same filters enabled on all of them. It would be nice if the built in adblocking was better.
For reference, it’s not as good as AdGuard for iOS because it can pass all the tests listed here but in Orion it only passes some even with the same filter lists.
App version: 1.3.27 (7) (WebKit 8613.7.1.0.15)
System version: 15.8.3
Device type: iPhone 7 Plus
Native bounds: (1080.0, 1920.0)
Scale: 3.0
Regular tabs: 1/https://adblock-tester.com/
Private tabs: 0/(

By having this, it would negate the use of needing Safari at all as there are some websites I need to use safari and AdGuard with because when using Orion the ads don’t get blocked and I get pop ups and redirects when it doesn’t happen in Safari and AdGuard for iOS.