I reluctantly went with the Snap on OpenSUSE Tumbleweed because I like to get auto-updates. I’d rather be using Flatpak (not keen on Canonical) but I can’t trust something as important as password management to a package maintained by a third party.
The Flatpak comes up in Discover as by “8bit Solutions LLC”, but at the bottom of the description is a note saying “This wrapper is not verified by, affiliated with, or supported by 8bit Solutions LLC.” To clear up confusion, Bitwarden should publish its own official Flatpak.