Crypto investors are turning to Military grade vaults to safeguard their Keys. While some prefer to know the Keys by heart, some have their crypto stash in physical dedicated crypto wallets like Trezor and pay big money to have them stored in Nuclear sheltered safe vaults. Take for instance
Swiss Crypto Vault who offers Nuclear sheltered vaults to crypto investors. if you had 2000 bitcoins what options would you pick?
actually all storage will always experience things that will conflict and will not be able to guarantee properly.
The best security is obviously being able to memorize and store it in your own mind, but there will be problems if you experience senility due to illness, it is clear what will be given to your successor cannot be done and will disappear with the circumstances experienced.
there will always be a good side and a bad side that will happen with whatever storage will be done, because no storage that will really be able to guarantee it will be safe, if always in contact with other people.
Good storage is clear that only relate to the closest people because it will be a link that can be immediately given when the owner has a problem.
so hardware like tresor, nano s, keepkey etc is the best option in my opinion.
There is no universal way to store keys. Any of the methods is good only for solving their own problems. Keeping information about seeds-pharses in your mind also has a number of advantages and disadvantages.
This method is good because you have access to the "data" alone. So far there is no way around this other than using the "5$ wrench method". Also, the advantage will be quick access to keys due to the constant "carrying" with you and the ability to freely transport across any borders to anywhere in the world. The disadvantage may be that "memory" can bring surprises, in the form of loss of part of the information due to age-related changes or the influence of the "5th wrench" due to trauma, followed by loss of data. That is, this information carrier is very fragile and not reliable.