Well it's incredibly difficult to quantify the risks associated with BTC storage, so it's very difficult to take appropriate action. The pro of storing your own

Well it's incredibly difficult to quantify the risks associated with BTC storage, so it's very difficult to take appropriate action. The pro of storing your own coins is not particularly better security, but more control of your security. You can do physical backups, encrypted copies, securely store them and make decisions about the physical risk of your coins over time. With Coinbase you're putting your trust in their security and you really have no control. It may well be safer in reality, but the attack vectors are all things you can't have any influence over.