If possible, take photographs of each house: the outside, the major rooms, the yard, and extra features that you like or ones you see as potential problems. And don't hesitate to return for a second look.
A 15-year loan is usually made at a lower interest rate. Equity is built faster because early payments pay more principal. In a 30-year loan, more interest is paid off than principal for the first 23 years, meaning larger tax deductions. As inflation and costs of living increase, mortgage payments become a smaller part of overall expenses.