Bip39 Seed. The passphrase is just not chosen from the predefined list of 2048 words – it could be any word or phrase you end up picking. What constitutes a "superior wallet" is one which has very clear, simple to access documentation on supported BIP expectations, derivation paths, and recovery https://geilebookmarks.com/story18950546/bip39-list-https-linktr-ee-bip39-bip39-word-list-pdf-no-further-a-mystery