It tends to be a mix. The convention rate rooms are usually in the garden wing, but that does not preclude someone from booking a room in the tower or for overflow winding up there.
When I was there for a FBMA convention I was booked into a garden suite room. My boss wanted club level and booked accordingly.
A number of years later I was there for travel agent training and about 2/3 of our group were in the garden wing. The other 1/3, myself included, were in the tower on the level directly above the monorail, which are the least popular tower rooms. Not that I really cared about hearing a little noise from the monorail. I looked out the window and saw the castle so I was in hog heaven.