BSB normally fills up the fastest because it is air conditioned, co-ed, and the closest to the academic buildings. Deming is all male, not air conditioned, but also very close to both the union and academic buildings. I live in Speed which is about the same size as Deming and BSB (100-120 students). Speed is all male and not air conditioned, but has the advantage of being near the parking lot and basketball courts and has a nice lake view. The triplets (Mees, Scharpenburg, and Blumburg) are much smaller and close to the union but further from the other buildings. The rooms in all the halls are all very close to the same size, except for Deming which has some three person rooms. That said, the hall or floor you're on doesn't matter as much as the people around you. The Resident Assistants and Sophomore Advisers give the floor its personality, and wherever you end up you will find people you can get along with. If you ask students here where you should live freshman year, almost everyone will recommend their freshman hall.