I struggle to find much difference between 42°C dry vs 35°C wet in terms of personal coping ability, for sure. Dry heat would always be my preference.

I think it's worth noting as well that in the article it lists 42°C as the temperature humans start to have things go wrong with their bodies. Both Texas and Iran are dangerously close to semi-regular 42°C, no matter the humidity. We're going to see lots of blue-collar workers forced into retirement, or worse, around the world pretty soon.