I used Onion for a while, but moved back to Safari. Too many weird issues with playing video, and autofill with tons of contacts (4-5k?). Miss the build in ad blocking, and that it's chrome is thinner, and picture-in-picture without some random extension.
For Safari, consider 1Blocker with all the additional extensions enabled (a top option since ~2015) or AdGuard. To make life easier on the blocker (less energy consumption), consider NextDNS.io or AdGuard for DNS.