The obvious difference is that bank robberies tend to have a lot more witnesses and recordings proving the robbery took place at all, let alone the persons involved.

The other obvious difference is that bank robberies don't have a long history of dismissal with excuses like “well the bank was asking to get robbed; look what it's wearing” or “the bank's husband doesn't need consent to take money out of it” or “it doesn't count as a stick-up if the bank is closed for the night”.