When the mortgage loan reaches the "bank underwriting" stage, how to choose between the two repayment methods to avoid going into trouble?

When applying for mortgage underwriting, there are two repayment options: "average principal and interest amortization" and "average principal amortization." The average monthly repayment amount of principal and interest is fixed, and the total interest payment is higher; the average monthly principal payment is fixed, and the interest decreases month by month, the total interest payment is small, but the initial monthly payment is higher. Choosing the right one can help reduce your total interest expense.