The PC dot has overtones. The HD Dry will have little if any. The regular Genera (not dry) is a nice in between head.
Agreed on those. Just a few notes about dots & damping:
Damping near the edge of the head (with MoonGel or tape) controls or eliminates a lot of harmonics, which accentutes the fundamental tone of the drum. Basically it eliminates a lot of ring, and enough damping can make the drum pretty dead.
Conversely, a center dot cancels a bit of the fundamental tone, which then accentuates the harmonics, or ring/decay. This makes a drum seem to have more attack, which is interpreted as volume (which is why 'dot' heads are reputed to be louder.)
Try this - with your snare wide open, no damping, hit the center of the drum and note the sound. Now place two fingers near the outer edge of the head, and strike the drum again. Next, place just one finger lightly in the center of the head and strike again close to that spot. You'll definitely determine what dots and damping do.
All that said, I prefer a 2-ply coated head (Evans SuperTough) for the best control of ring without taking the life out of the drum.
Bermuda