without a doubt bank is more safer and better than a wallet.there is a guarantee we will not loose our money but in a wallet it can be hacked and after that I dont think there is any chance to recover our bitcoins.
Absolutely the safest place to store my opinion in the bank because there is a security guarantee for our money. Banks and wallet have their respective roles in my opinion. I use the bank to save money while my wallet to save the profits of bitcoin for a while.