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The common aspect is heavy metal. Regardless of manufacturer will be the practical use of radiating thermal energy. The overall heated plate/rolled steel mass will handle a large cold mass (100-200 lbs) better... also more wind resistant compared to a thinner sheet steel.
As to the brand... am a confirmed member of the Lang gang. Started off with a 48 patio... upgraded to the 60. Enjoyed filling it so often upgraded to the 84. Each pit was bought used and made a road trip picking it up myself. (It was the Pretty Good BBQ event which I saw (3) Langs loaded to the max and proved its mettle to me)
often, and this time of the year is a good opportunity for a choice pit.
Here is a pic of the following year - 4 Langs
The Lang proves its worth with the reverse flow design - reducing hotspots too.