It is wrong to only use one option if you ask me. I personally prefer multiple options and multiple backups.
For example you could have a hot wallet on your desktop or your phone containing a small amount of bitcoin that you may need quick access to whenever you want to spend some bitcoin.
Then you also want a secure storage to keep the bulk of your bitcoins which is when cold storage comes in. For backup you could use paper wallets alongside your digital storage (burnt on a disk or a USB stick or old computer,... all airgap).
If you rely on one solution (digital storage for example) you could end up losing access (e.g. data decay in this case).
satoshi who stated it that he has saved it and buried it
Where did Satoshi say this?