The more expensive one seems like it would have better airflow because of the extra side fan, but there aren't too many other differences between the two. What is your mobo/price range? Are you looking to build a new system or put your current one in a better case to accommodate 2 GPUs?
I just got the one below, and built my computer last night. There is TONS of room, and the airflow and noise levels are excellent. It is a full tower, so it will have plenty of room for everything, but is kinda big.COOLER MASTER HAF 932 Advanced