Well instead of writing an essay, let me put down my points on PROS of both
Pros of BTC wallet:
1. Anonymous
2. Can be withdrawn anytime
3. Can withdraw small amounts
4. Can withdraw large amounts hassle free
5. Can transfer 5 times in a minute without any hassle
6. Exchanging is hassle free
7. Receiving is very easy
8. Can create several accounts
Pros of Bank wallet:
1. Secure, can prove your money
2. Safe, will not go bankrupt soon.
3. A lot of e-commerce website prefer this
4. A lot of banks allow safe invest
5. No scam and privacy
6. Bank currency is not volatile
Bitcoin is not 100% anonymous that's why people use mixer. We have different definition of small amount and most of micro payment that pays really small can't be done because fee is higher than the funds that's going to be send. Transferring your coins depends on how big the amount your going to transfer, higher amounts take more time and some take atleast 30-1 hour.
Banks is not secure is what you think, because they put limit on how much you can withdraw money. There are banks that go bankruptcy because of country's debt. Banks can't scam people but people that fooling people like making a website that deceive people it's a bank can scam.