The answer depends on your situation. If you can totally afford a 25 year amortization, then it would be considered "better", as you would pay off your mortgage in less time and pay much less interest over time. But maybe you cannot qualify for a mortgage with a 25 year am. In that case a 30 year am is essential. In fact, a couple of lenders will even offer a 35 year am if necessary. If you are going to have a 30 year amortization, you MUST have at least 20% equity in your property.