What do you find worse - dry heat or heat & humidity?

Just wondering what others feel is worse. What do you think is worse, riding in a dry environment (desert) with 110F temperatures or riding in an area where the heat and humidity combine to give a temperature of 110F?

IO figure that at lest in t he desert sweat can evaporate and thus cool you but when there's really high humidity the sweat does NOT evaporate and thus you lose most of the cooling effect of sweating.

Opinions?

Cheers