A good post with more info on this is found here.
In short, Z-wave is a standardized protocol, but I think you might be mistaking what standard means here.
Z-wave is not used for alarm monitoring purposes on any Alarm.com compatible system. Z-wave is a mesh network with limited individual device range, and battery operated Z-wave devices rely heavily on AC powered repeating devices for communication with the hub.
Dedicated panel rf for security sensors is point to point communication with extreme range comparatively. Examples are GE 319.5, 2GIG/Honeywell 345, DSC 433. PowerG is another RF and is generally the best option for new sensors.
The IQ Panel 2+ comes with a PowerG radio and one of three legacy sensor radios, 319.5, 345, or 433, which you should choose depends on what existing wireless sensors you have.
Z-wave is used exclusively for automation devices like light bulbs, switches, door locks, thermostats.