Balance in balance sheet?

Balance per book.

The reason for this, is simply because you can make a withdrawal (cash, check, etc.), that doesn't hit the account until after you've already paid for something. Banks perform processing on the accounts once a day, and checks can take 3 business days to finish clearing (or more, if there is a holiday and/or weekend).

Think of it this way. You write a check to pay for a bill. It takes a day or more to get to the destination, and then they have to deposit it into their account, and then their bank (and yours) have up to 3 days to reconcile that the amount/account is correct.

Before electronic banking was prevalent in the US, there would often be 7-10 days before some of the checks I wrote would be cleared and the funds removed from my account.

Balance per book for balance sheet account because it includes more of your actually transactions...usually just missing bank fees.