Bip39 Passphrase. Due to the cryptographic style and design of BIP-39, a weak passphrase won't reduce the protection of the opposite wallets or aid expose the seed words. What constitutes a "very good wallet" is one which has clear, very easy to access documentation on supported BIP standards, derivation paths, https://bookmarksoflife.com/story4505043/bip-39-https-linktr-ee-bip39-the-single-best-strategy-to-use-for-bip39-wallets