Rating a skimmer is the fuzziest thing I have come across in this hobby. Everyone at somepoint wondered if their skimmer is right for their tank. If the skimmer pulls gunk, you know it is working, the question is, is it adequate.... a good indicator is the nitrate in your tank, if you see it steadily increase overtime, inspite of your normal maintenance, then your skimmer probably need to be tuned or upgraded.
I like to skim wet cause it keeps the neck fairly clean, clean neck mean good performance. Start with wet skimming, and if you start seeing foam break breakdown too often then move a little more towards dry...... This way you are chasing the skimmer on its maximum efficiency curve...