Well, what I have been told, and what I've read is that wet (really just damp) creates more smoke for longer.
Whether that's true or not, I haven't measured.
(Check out Myron Mixon, Steven Raichlen and Ray Lampe - those were my sources)
But my approach has been long smoke - so a combination of dry and wet that I use seems to start smoking sooner (the dry), then by the time the dry is used up, the wet chips are dry, then they begin to smoke.
So it seems to delay their burn.
In essences prolonging the smoke as opposed to everything going off at once.
In colder months or with low smoke temps, I tend to use dry only, they seem to catch faster and I never drop wet over dry - found out the hard way that puts the "fire" out.
My EMS says 1/4 cup of chips, if I over load it, nothing really happens.
It all drops on basically a flat aluminum plate with an electric burner below.
Seems to work for me, your results my vary