Unless you stop using Firefox Account or Vivaldi Account, which are both real spy tools, not telemetry, which is indeed harmless and hellpfull not only to devs, but to yourself (to make browser better), Brave accountless sync will always 100% better solution in terms of privacy and security.
Unless you stop using Firefox Account or Vivaldi Account, which are both real spy tools, not telemetry, which is indeed harmless and hellpfull not only to devs, but to yourself (to make browser better), Brave accountless sync will always 100% better solution in terms of privacy and security.