I have worked on, serviced, programmed, and monitored most of the brands listed above and to say the least, they all have their strong and week points.
Dsc is a preference as to functionality, ease, simple for the customer to use.
Most are installer friendly and programmer unfriendly. User friendly (EASY, Simple)
Since the upgrade of programmable features and ease of programming features it has made the systems easier to set up, program, turn over.
It still does nothing for professionalism.
The Stick on,Test, run method still has problems with the lack of training, knowledge,and professionalism in the industry.
The RmR is great , and Company Exec,s love it, keeping install cost down , and long term contracts up.
Over the years i have installed Adempco,Dsc,Ge,Radionics,Bosch,and many older panels where we went from the programmable, chips , eproms, Dos based to a computer based programmable type of programming.
I could not go back due to ease of use, functionality, programmability.
The Strong pt is time, less time to Install & Program, make changes, Turn on, shut off, secure the programming from installers, and make the industry a walmart of security.
This makes the employees low paid, non trained, expendable, easily replaced. lack of loyalty. What we have found over the years is the attitude is this way industry wide.
The Systems are only as good as the representatives, Installation, Service behind the installation, and the Responsiveness of the company to fix, repair, program in a timely manner to meet the expectation of the customer. Many systems installed improperly due to lack of training or company policies.