There is a certain logic in the idea that smaller Orcs rather than Uruks rode the Wargs. Although large, the wolves were, I think, nowhere close to horse-sized as portrayed in the movie. Gandalf's comments in II.4 ("These were no ordinary wolves hunting for food in the wilderness.") suggests that Wargs were at least close to normal wolf size.
If Sam and Frodo could be mistaken for Orcs in Mordor (VI.2), then the size of the average snaga must be rather on the runtish side. These smaller types would seem to make more accurate riders for wolves that were large but not gigantic.
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