Number of physical buttons
Smart hub required
Suitable for outside
Smart thermostat | Avoid unnecessary heat loss
With a smart thermostat you can easily control the (hot) water supply in a room. You can i.e. co-heat a room - or not - when you heat the living room. What these thermostats cannot do is heat a room independent of the living room.
If you want to be able to regulate the heat per room, choose a zone control where each room needs its own thermostat.