If I decided to save bitcoins in bank, how will deposit rate be changed compared to dollar or other currencies? Will it have much lower percent?
Your question is pretty confusing since there are currently no bitcoin banks that are available to deposit money in, maybe you may be talking about online wallets?
There is really no interest you can get from banks, but if you hold bitcoin for a couple of years it will most likely rise in value since bitcoin usually rises in value over time.