We passed on Coral Reef because if you don't get a table right in front of the tanks, it's not all that awesome of an experience. When we peeked in there, we commented on how it would kind of suck to be stuck way up at the top level, so far away from the tanks.
It looks really cool in there, but I just know I would be kind of harumphing inside if I was seated far away. So, we opted for 50's Prime Time and it doesn't matter where you are in there, it's just fun.