Homematic: CCU2 or Homegear with CUL


currently i am using Z-Wave Deices and Hue Lights.

However i am not happy with the range of devices for z-wave. I am missing things like a cheap heater thermostat, a difference thermometer and something like this:

So curently i am leaning to purchase a ccu or a cul (for use with homegear). However i am not sure what is the better option.

I would like to have the heating as stable as possible.

What is your opinion?