A similar look at Safari vs Chrome on Mac would reveal that Safari is much less secure than Chrome; given that many iOS exploits rely on WebKit, the average iPhone user is strictly less secure because of Apple's ban on fair browser engine competition.
Uh, yes? There's 18 here (just for January 2022, mind) of which only 4 don't affect the Mac version.
https://www.mozilla.org/en-US/security/advisories/mfsa2022-0...
December 2021 has 13, only 1 doesn't affect the Mac.
https://www.mozilla.org/en-US/security/advisories/mfsa2021-5...
etc. etc.