Best Ceramic Infrared Sauna

My doctor has me using a ceramic sauna in their office, but the thing is ancient. I wanted to get a more modern carbon one like a Radiant or Clearlight, but they are insisting on the same style for the duration of my treatment. Do you really think I need it, or will be any different whether ceramic or carbon? Just not sure what to get, but can't keep going to the sauna place to rent sessions. I'll own a sauna in no time if I buy one instead of renting. Thank you! https://youtu.be/uJxggBbSWPY