Have you played either? Because I play both characters all the time in the jungle and Riven is faster then Skarner. Skarner is better then her. But Riven is definitely faster due to the higher dps, and better movement speed. She also jungles perfectly safe after level 4. Shrug. Skarner levels safe at level 1 and has better ganks. Speed isn't everything but don't try and suggest that Skarner is faster then pretty much everyone. Because he is merely in the upper half for speed. His counter jungling due to how damn tanky he naturally is and how retarded his ability to run away is are bigger issues.
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Whatever...