When it comes to online security, there is no one-size-fits-all solution. The best security key for Coinbase will vary depending on your individual needs and risk tolerance.
For example, if you are storing a large amount of cryptocurrencies on Coinbase, you may want to consider using a hardware wallet like the Ledger Nano S or Trezor. These wallets provide offline storage for your private keys, which makes them much more secure than keeping them on an exchange like Coinbase.
If you are only storing a small amount of cryptocurrencies on Coinbase, or if you are comfortable with the risks associated with online storage, then using a service like Authy or Google Authenticator may be a better option for you. These services generate two-factor authentication codes that you will need in addition to your password in order to log into Coinbase.
Ultimately, the best security key for Coinbase will depend on your own personal security needs and preferences. If you are storing a large amount of cryptocurrencies on the platform, it is important to take steps to ensure that your account is as secure as possible.