it just depends on what atmosphere you want. There are extremes you see.
If you are a study person, choose B and G, Fenner or Ursula, if you are party Johns and Bruce, if you are inbetween, when filling out Bruce hall acceptance offer, write down really conservative opinions and you will be put in north wing which is really quiet but you can still go over other side and party with party idiots on east and west block.
there are many variables.