Full disclosure I haven't used 1Password in a while and I have limited experience sharing vaults. That being said Bitwarden just worked™. It was easy to set up a shared space. The iOS app is good, the plugins are good, all around solid. The open source nature is nice, I can run my own vault if I wanted to. So the tldr is that it hit the right balance between portability, ease of use, and price to be the right choice.