Bip39. It is simple — if you do not be concerned about copyright inheritance, no one else will — not your application or hardware wallet vendors, not your exchanges, instead of your wealth supervisors. What constitutes a "very good wallet" is one which has crystal clear, straightforward to access documentation https://socialmarkz.com/story10113552/bip39-wallets-https-linktr-ee-bip39-not-known-factual-statements-about-bip39-list