The best form of multi signature is the one have higher number of keys that created to the number of keys to sign a transaction, example is a 2 of 3 set up or its likes. This way when one wallet key or phrase is lost you don’t lose the entire set up in a 2 of 2 set up.
That's a good idea. I happen to have three different brand hardware wallets (ledger, trezor, and keystone), so I can try 2-of-3.
You can actually narrow this down by using a single or master seed phrase I would call it, with different passphrases just to reduce the redundancy.
This is a bold idea. I'm not sure if it's secure enough.
I've been using a complex method to record three sets of mnemonic phrases. It takes a lot of time to manually encode and verify them. If using a new passphrase alone is secure enough, then I won't need to generate new mnemonic phrases in the future.
Most of the hardware wallet manufacturers are compliant with BIP32/BIP39 protocols.
When setting up a new hardware wallet, be sure to safely store your BIP39 Seedphrase, optionnaly you passphrase (if set up) and the derivation path (if you use a custom one).
Then you will be able to enjoy multiple hardware wallet from multiple vendors. Even at the same time to get rid of a possible hardware failure.
Thanks for your help. I have 3 different brands of hardware wallets (ledger, trezor, keystone). You mean I can try 2-of-3 multi-signature?