SLIP39 which is shamir's secret sharing for mnemonic codes is the one that is not official. Also I prefer seed phrase which mist wallets supports. I will prefer to add passphrase. If it involves more than one person, I will prefer multisig wallet.
I’m still a novice here, but don’t multisig and Shamir address two different needs/issues?
Multisig exists so that more than one person is required to authorize a transaction. But Shamir exists so that more than one seed shard is required to restore a wallet seed phrase. Is this not the case?