Word + Bib. Although it makes use of BIP32 approach you could still import BIP39 seeds into Electrum wallet. Also apart from BIp32 You can find BIP44 version which some wallet use for the era of seeds. The obvious way to keep you seed recover phrase is with a Billfodl https://finance-bank81470.mappywiki.com/1111114/the_anatomy_of_the_bip39_phrase_entropy_words_and_phrases_and_safety