You can actually just do it in the store.
When I was in their garden department years ago...
I would show the difference between the two to the customers.
Standing in front of the IR they would sense more heat, and placing their hand over the top of each they would feel the hot air rise from the convection.
I also explained that since their was a maximum wattage that was put out from the wall outlet - they overloaded the one there more than once - that more elements did not increase the heat output... it allowed for the user to ''turn down'' the heat by having the appliance shut off power to one or more of the elements.
Using less power made the system more efficient since the operator felt warm, but not overpowered. Most units only had two back in those days, so the option to turn it down was rather limited.
Ceramic to quartz was an upgrade as the ceramic had more conduction than radiation in relation to the total.
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