I think styles depend much more on the individual than the school/instructor. Unless you're getting a lot of attention from the instructor or tons of privates. I guess my instructors and all the affiliates like to emphasize pressure on the hips for control, and shoulder pressure in the neck when passing, along with passing pretty low. But, they teach a ton of techniques, and cater to different styles/interests when questions are asked about details. We've got wrestlers, flexible guard players, unorthodox twisty turny guys obsessed with inverted moves, crazy army guys that try to choke you to death from anywhere in less than 30 seconds, passive guys, etc etc.
Really, while you're rolling, you decide how to do the techniques, and what techniques to do. Style is (should be) the individual's choice, not the school's. I think most schools have a healthy variety.