Aidan's doesn't have a pizza bar but Grey does and is much better than Collingwood's :P.
Given you've mentioned Trevs students move every term it may be worth mentioning that Mary's and Grey also do this, though I believe at Grey they tend to stay in the same corridor so unless they share 2nd term they tend to keep rooms for 2 terms, or this is what someone I know has said anyway. Might be worth mentioning that Aidans is the only hill college that would make you share for the full year unless you come to some sort of arrangement with another student (like our friend/previous housemate did). Actually I'm not sure about Collingwood but I think their shared rooms aren't generally used, like at Hild Bede.
Might also be worth mentioning that all Butler rooms are ensuite whereas at other hill colleges you only get ensuite if you have good reason to or are very lucky.