From those I've talked to who have gotten into the two schools, I've heard from more people choosing cooper. I'd probably be able to give you more insight once I actually start in the fall. From what I understand, it's a rigorous nonstop arch program. Student only have two non-arch classes freshman year (English and Calc). And students are in the studios almost all the time - even on weekends. It's a challenging program, not to say it isn't at all arch schools
I'd say a major perk is the individualized attention you'll be getting. Like I said, the freshman class size generally hovers around 20 or 25 students.