For a basic system installed in a house at the construction the most economical is a Honeywell system. It is easy to install and the cost of equipment can be kept down.
Unfortunately most Zoning systems are not installed at the time of construction, so it becomes necessary to divide the HVAC system into zones by placing controls in each individual run. This will cost more on the installation but can give you better control of your heating and cooling for more comfort. When this is the choice to be made I go with Arzel Zoning.