Your funds is only as safe as the device you store it in, i.e. if you store your funds in an airgapped wallet, it is safer that someone who stores theirs in an online machine. However, you must also know exactly what you are doing, so many people create their airgapped wallet in an unsafe environment and end up losing their funds. Opsec is also very important, as well as implementing extra layers of security, i.e. extending your seed phrase with a passphrase or setting up a multisig wallet.
Storage is important but so is the usage. You'd have to be sure to use your keys only in sanitized environment, and preferably separate from each other in the case of multisig or it'll negate the benefits. Extending your seed phrase would ensure that the adversary won't directly gain access to your wallet but it doesn't mean that you won't be susceptible to extortion or a $5 wrench attack. A good way to keep backups would be either in a safe or if you know what you're doing, hidden with steganography.