Hey bud,
Old Court has larger rooms and it's quieter. Aesthetically it's definitely better. Old Court is separated into blocks, and each block has 12 rooms, 1 Kitchen, 3 Bathrooms. New Court on the other hand has corridors, with up to 30 rooms, I think 1 large kitchen for each corridor, and communal bathrooms (it more resembles the dorms in the U.S.).
Of the two sections, New Court is definitely more sociable. Expect loud music, people being loud before and after clubbing, and always having something to do (if you're a sociable person). I was in Old Court, and had a great time. I should say though that it really depends on all the people you're grouped with. If you don't get along with your roommates from your block, you might find yourself spending the majority of your time in another block / new court.
If you have any other questions, feel free to ask them!