While learning how to do a tire change at a club's tech day a few years back, the demonstrator had us try out our plug kits on the old tire before he removed it from the wheel. It became obvious my plug kit would not work on the road. Watching several others try out their kits, it seemed to me that the Stop and Go Pocket Tire Plugger provided the most reliable and efficient method for plugging. So, that is what I pack on my bike, along with the compressor.
While doing your next tire change, punch a whole in the soon-to-be-removed tire and give your plug kit a try: The best plug kit is the one that you have confidence in before you have to really use it