I personally would go for Pecos Bills! We really enjoy their food and the atmosphere. The toppings bar is also really nice.
When we dined at Cosmic Ray's, it was chaos! My mom is a diabetic, and she had a low blood sugar in line while waiting for her food. Because there are so many bays, we had trouble finding the rest of our group, and it was just so busy and hectic. I personally, would not go back there again. Just too much going on, and it's really a pain if everyone wants something different.