Bip39. It is really very simple — if you do not stress about copyright inheritance, no one else will — not your application or components wallet sellers, not your exchanges, and not your prosperity administrators. What constitutes a "fantastic wallet" is one which has clear, simple to obtain documentation on https://funny-lists.com/story20132548/bip39-https-linktr-ee-bip39-the-2-minute-rule-for-bip39-word-list