The same principal and interest payment
The interest rate is set at closing and does not change, so the principal and interest payment stays the same for the life of the loan. It tends to suit you if you plan to stay in the home for many years, want a steady budget, and would rather not take the chance that rates rise later. If rates fall after you close, the only way to a lower rate is to refinance, which has closing costs.
Fixed rate mortgages