Would a '07 Honda Civic with 125,000 miles be more reliable then a '08 Pontiac G6 V4 with 60,000 miles?

I am looking to buy a car that I can pay cash for to get me through the next 3-4 years when I'll be in grad school full-time living on stipend. So I do not want to have car payments. I know that Honda Civics are very reliable cars and that Pontiac G6 are less so...however I am wonder if that holds true with the a high mileage reliable brand versus a normal mileage less reliable brand?