I have gotten 2 yubico 5 NFC keys. Should I choose the yubikey OTP option or the FIDO UF2 for bitwarden? Thanks in advance for your input.
FIDO U2F is much more secure and cannot be phished. You can also use the cheaper Yubico security key. However, I have heard that not every platform will support U2F, so perhaps others can chime in.
Nothing beats FIDO/U2F other than FIDO2/webauthn. That said, as of right now, not all platforms supports U2F. Yubi-OTP is support on Android, I am not sure about iOS or Desktop. Once webauthn works on Android, I can drop all alternative 2FA methods.