Would you get the 2010 GMC Terrain FWD slt-1 or the 2010 GMC Acadia FWD slt-1? They work out to the sameprice?

The Acadia has 0% financing for 60 months. Its a 39,000 car. The Terrain is a 31,000 car and at the interest rate Id be paying it would turn out to be 39,000 paid by the end of term. The Acadia is a 660$ a month payment for 5 yrs and the Terrain is a 550 payment for 6 yrs. Help me decide! thanks