Yes, ADT is better than Bay Alarm. Besides having nationwide coverage as opposed to Bay Alarm’s west coast coverage, ADT is also a reputable company with over 100 years of experience. No other alarm company in the U.S. has been around for that long. In terms of feature, though, ADT and Bay Alarm are almost on par. ADT is well known for its modern take on home security that includes cellular monitoring, smartphone control, home automation, and video monitoring. Bay Alarm, on the other hand, has a well-rounded system that works best for individuals who might need medical help, thanks to its medical emergency response offering.