There is not currently a completely correct answer to this question. Most modern day alarm systems by well known and trusted manufacturers are all great in their own way. Visonic and the Visual Verification PowerMaster family of alarms are a well known and respected brand within the security community and have been making high end Grade 2 alarm systems for many years. Their products are tried and tested by hundreds of installers all over the country and thousands worldwide. RS1 as a company did many weeks of research into many different types of alarm system before deciding that Visonic was the best alarm system to install.