US Visa requirements - which one saving account / credit account ?

My parent's visa application has just rejected. Now we're preparing for the 2nd time. As businessman my father has both saving bank account (not much and not really active), and credit account (active / daily transaction). Which one you think suitable according to the requirement for applying visa (below)? I am thinking credit account will have point to prove the binding to home country (as the business is still running), but it's credit means negative?
Below is stated in US embassy website:
This is the requirement as stated in US embassy website
"Tourist visa applicants must establish to the satisfaction of the consular officer that they have binding ties to a residence in a foreign country which they have no intention of abandoning, and that they will depart the United States at the end of a temporary visit."

I suggest that you ask your parents what the consul asked them and exactly what they replied. Also, your father should have submitted ALL bank records. Let them sort it out. You never know what they are looking for. Include everything about the business, like Articles of Incorporation, business permits, income tax returns, office lease, house title, enrolment forms of the children who are in school.

Here is a link that may help.**

Which bank offers the highest interest rates payout for saving account?

I would like to open a foreign bank account in any country.

Keep in mind currency fluctuations when opening savings accounts in foreign countries. Those that pay higher interest can also have higher inflation, so you'll gain nothing at the end. Might even lose some.