1. How long will you actually keep this loan?
This single answer moves more money than the rate does. Five years in the house makes buying points, and often a 30-year fixed, the wrong shape. Thirty years makes them the right one. Nobody can predict it perfectly, but an honest estimate beats a default assumption.
2. What is scarce — cash or monthly room?
Short on cash to close? Lender credits raise the rate but cover closing costs. Short on monthly cash flow? Points lower the payment but consume cash now. These pull in opposite directions and the right pick depends entirely on which constraint binds you.
3. How clean is the documentation?
A W-2 borrower with two years at one employer has the widest lender pool and the best pricing. Every wrinkle — self-employment, recent job change, non-warrantable property, a credit event — narrows the field. Knowing which lenders remain in play before you apply is most of the value a broker adds.