Why does the cactus make more use of dew than the mesquite bush?

The mesquite (Nahuatl mizquitl) draws on three sources of water whereas a cactus depends mainly on one.

Specifically, the cactus depends upon water vapor taken in by the stem's pores and moisture taken up through its roots. The mesquite also takes in water vapor by its stomata, and soil moisture through its roots. But additionally, it has a 190 foot/58 meter long taproot that draws moisture from the water table. The plant can coordinate the use of all sources, or switch suddenly back and forth in its reliance. Consequently, the mesquite makes more water droplets than the cactus.