While you are still in paid employment, you may not worry about the bank for your pension account. The pension administrator will take care of that.
This is because your employer will credit your pension savings account through the Pension Fund Administrator when your salary is due.
At retirement, you may either decide to use your old bank that you are familiar with or simply open a new account in another bank for the payment of your pensions.
As you will have to be relating with this new bank, it would be adisable to find out about the bank that is most appropriate for you.