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The wallet doesn't matter, as long as you have a BIP39-compatible seed (which you can generate with many utilities), any software (or hardware) wallet can be used.

As far as I know the best option is still printing a newly created address and private key on archive quality paper and putting it in a bank safe deposit box. If you don't ever spend from that address the key should be safe. Best practice is to use an airgapped computer running a live CD so the key will never have been on a network. It should be easy to find tutorials on paper wallets. It's not user friendly for sure, but if you want to protect a large amount of Bitcoin it's the best option.

Look into the Ledger Nano S. Supports each BTC chain, other cryptos, and is super easy to use IMO. Uses a seed to create the wallet so you can drop that in a safe deposit box and restore if anything ever happens to the hardware wallet.

Edit: this is the hardware version of storing cryptocurrencies.