No real difference as far as banks go savings wise.
A commercial bank has a normally has commercial mortgage division and offers loans to clients for commercial loans and agricultural property loans.
Sometimes they have the best rates but the underwriting requirements are a lot stricter. Many of them work through the SBA.
Anyone that has been through this process learned that this is not the easiest way from point A to point B.
They often require cross-collateralization on their purchase loans.
There are other alternatives at a little higher rates but less hassle.