Was just wondering which is a better reefer refrigeration unit Thermo King or Carrier and why?

Marten has both and after working there I was more pleased with the Thermo King. It's quieter than the Carrier which is a big reason and I also never really had any big breakdowns with them. On the Carriers however I had a water pump go out a couple times. Also, the Thermo King didn't seem to shake the truck as bad as the Carrier when they started and stopped.

Thermoking. Period.

Anything will break down on you at some point. I've had a hell of a lot more trouble out of Carriers than Thermokings. Enough more trouble that I will no longer ever own a Carrier.