I have seen countless references in this forum to the greater control over a thermostat you will have by selecting a compatible Z-wave thermostat over the Nest thermostat. The thing is, both my HVAC contractor and my solar provider (?) are giving me a free Nest. So, what is the real difference in what I can control on a Nest thermostat with Alarm.com versus something that is compatible with the panel. What would I be giving up?