Out of all types of interest, mortgage interest is the only type with a tax benefit. If you itemize your deductions, then you can write off your mortgage interest on Schedule A. If you ever need additional funds, a home equity line of credit has the same advantage over other types; the interest is deductible on Schedule A. In that respect, taking a Home Equity Loan to buy a car makes more sense then an actual car loan, as you can deduct the interest. The same thing applies if you have CC debt. Pay off the CC debt with a Home Equity Loan. You will have a lower rate and you can deduct the interest.
I have also considered a 30 year vs a 15 year mortgage. We have a 30 year, with a lower monthly payment, and that makes more sense for us. Rather than refinancing into a 15 year mortgage in the future, and its likely higher monthly payment, I prefer the flexibility of just making additional principal payments on the 30 year mortgage in the months we choose.