I've only been a home haunter so far. 2012 will be my first real haunted house. I've also done lots of parties. I've never owned / used a pressure pad. I've only used Motion Detectors and only had 1 fail me in all the years of using them. (sometimes buy new ones though)
I've used a triggering button sometimes, when I was using a guide and needed timing to be perfect. Other than that, I'd say I've always used motion detection.