Now I ask you, how secure are crypto wallets? Every day I think it is more essential to have a cold wallet.
I have preferred multisig and cold storage, they are the safest of all. Some people can go to the extent of buying two hardware wallets and using both to create 2-of-2 multisig wallet, this is also secure.
For seed phrase backup, there is nothing bad to backup your seed phrase or paper or on metallic sheet like steel sheet, having up to three backups and in different locations.
but still I would say if you can remember all the words the place to keep it safe is your own mind, however, in this case, you better make sure if you can keep the word in your mind.
What you are not reciting and writing down everyday will be forgotten, seed phrase are not used everyday, even though if seed phrase are used everyday, it is still not recommended to memorize it because memory can fail someone. This will only be an easy means to forget your seed phrase, when you lost access to your wallet will be the time you will realize it after trying to import your seed phrase on a new wallet.