I look at a controlled push as a few guys slowly moving and frequently stopping almost like a stalk, toward one or a few set shooters waiting on deer encouraged to move towards or past them. These deer are likely to move a bit and stand and look back.
I look at drives as a group or line of pushers not concerned with how much noise they are making and maybe even intentionally making noise to get deer out in front of them to run towards or past set shooters. I don't like them, do them or endorse this.
Why? It's too dangerous. I don't believe that the rule of, "Be sure of your target and what is beyond it." can be followed when you are making fast offhand shots at a deer who has a constant change of what is beyond it.