This is a scale of 1 to 5 to give us an idea of how well you want the system to perform.
1 is Basic. These systems have simple controls. They may take longer to get to temperature, and once it is heated the room may overshoot the setpoint temperature by a noticeable amount. Zone balancing may also be difficult if necessary. It will be cheaper to install but will require more labor and time to get it to perform as expected.
5 is the Best. These systems come as close to a "transparent" heating system as possible. They have excellent controls set to monitor and adjust system performance to the ever changing environment. They start up more quickly, maintain optimal temperatures and run far more efficiently for fuel savings. If efficiency and comfort are highest on your list choose the highest value for performance.