What did you find was the main difference? My car is confirmed to be built in 2 weeks so adding an option could delay that I guess.
Main difference is convenience. Just set a temperature and that's it.
If the cabin is too cold, it will blow warm air
If the cabin is too warm, it will blow cool air (or chilled air if the aircon is on).
Climate control also controls where the air comes out, warm air usually from the footwells & face vents (so it can rise), and cool air from the screen/ face vents (so it can sink). By doing this it helps to minimise temperature gradients in the cabin.
It also adapts fan speed, temperature of the blown air from the vents, and where the air comes out as temperature changes during your journey without you having to do anything.
Manual aircon has the same basic function (fan speed, windscreen/face/footwell), but you have to set and adjust warmth, fan speed and which vents to use yourself. They won't change themselves.
Do you find on a journey that you have to keep adjusting the heater up or down yourself? Climate control will do that for you.
If I recall, manual air-con is single zone ie one temp for whole car. Climate control is dual zone so if you have a passenger who likes it warmer (or cooler) that the driver then you can set different temperatures for each side of the car.