KeePass, and more specifically the KeePassXC (desktop) and KeePassDX (Android) ports.
My wife and I have shared a single KeePass database for about 15 years now and I couldn't imagine switching to anything else.
My reasons have remained the same over the years:
- Free and open source
- Offline (but supports cloud sync)
- Lightweight
- Cross platform
- Supports autofill
I would never entrust the management of my credentials to a 3rd party online service. They're an easy target (it's only a matter of when, not if they are breached), and they could go out of business at any time.
We don't use cloud storage for anything these days, but we keep the KP database (and many other things) synced across more than 7 devices using SyncThing, another amazing FOSS project.