I recently switched to trying iOS after all of Google's recent Android nonsense and tried all the options. Brave didn't make the cut as it failed to block all the embedded ads on reddit (my personal litmus test). The Orion browser, OTOH, did a great job at it.. and it also supports the full version of ublock-origin if I need even better ad-blocking. It has a few rough edges, but is working out to be a nice default web browser for the phone.