Hi! Are the skiff sailors better SAILORS than the cat sailors? No.
Would the best 12-foot crew have a chance in the Tornado Worlds if you put them on a Tornado? NO. (If they raced the Tornado a couple of years they might be able to give the Austrailian top sailors Forbes/Bundoc a match.)
The differance is that the cat is stable when sailed gently and the skiff isn't. Each boat requires more or less training before you can handle it without swimming. When you stopped swimming and have good speed in most conditions the major thing left is tacktics.