from the current phenomenon because bitcoin has matched real money we use for payments or transactions for purchases, therefore automatically security is more sophisticated, but it's not as safe as cash that we use everyday..
But not all payments or buying and selling transactions accept bitcoin, only a few countries actually accept bitcoin as payment. For security issues Bitcoin still has a very big risk, because if you forget the key to the wallet containing the bitcoin then no one will be able to open it again or if the private key is hacked no one will guarantee the full asset back
The safest is still Fiat or real money managed by banks. Bitcoin is still optional and can't really match real money.