im not sure about brock but i can tell you about mcmaster:

there are 2 quads, west quad and north quad. north quad has mostly doubles/singles/traditional, with the exception of the newest building les prince which is a double with washroom. most have a tunnell to the commons- the main caf and in these residences, you will definitly meet alot of people since shared washrooms encourage interaction. i got to know my floor very well! brandon is the tallest and definitly the party one!

on the west quad, its mostly suite styles. keyes is suites, bates is apartment and theyre typically the most wanted, however they dont encourage interaction since most people stay in their rooms. moulton is triples, and spacious. its pretty nice, they have a large common room.

no matter which rez you go to you will have an amazing time! your rez experience is what YOU Make of it. stay in your room all the time? you wont have a good time. be open, meet lots of new friends? youll have an amazing time.