GE/UTC Concrod VS. Vista

Looking at getting a new system for the house I just bought to replace the existing Moose system that is over 20 years old and surprisingly is still working and monitored! A few of the local companies here in the Houston area install GE/UTC systems, but some will also install Vista systems if requested. My parents house already has a Vista 20p system and we have not had any issues with it. Are there any advantages/disadvantages when it comes to Honeywell Vista or GE Concord systems?