I've been happily using #GrapheneOS for months now, very impressed.
They maintain #Vanadium, a hardened #Chromium fork. Sadly both lack the option to put search at the bottom, year old feature request:
https://bugs.chromium.org/p/chromium/issues/detail?id=1284380
Big shout out to #DivestOS team for creating the attached comparison tables! Seems like #bromite and #brave are most all-round secure & private mobile browsers.