[Squantum]

I feel like the 'debt snowball method' may be best suited for consumer debt (credit cards and cars primarily).

What about this: say that somebody has a 6.25% mortgage for $300,000, a new one with basically 30 years to go, and a 3.125% student loan of $10,000 with 15 years left. Now, we are not talking about credit cards; we are talking about fixed-term debt. One debt interest rate is 2x what the other is, but one debt is also 30 times higher. With aggressive payments, that $10,000 student loan could be paid off a lot quicker than the actual term. But the higher interest rate debt -- the mortgage -- has a principal amount that is so much higher that it would take many more years to pay off than the student loan, even with putting extra money toward that mortgage...