Totally different kites, even if you compare the DS with the WM.
I like them all, but they are not comparable IMO. If you like steady tricks at a slower (compared to the others) pace with a more "french" sort of feel, then the WM is the way to go.
More freestyle, fluid pace, and a less-angular, more rounded tricking style, then go for the DS or Exile or Fearless.
If it's a strict Gem versus WM choice, then I would go for the WM.