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From a design perspective Zoroark's silhouette is much more interesting than Lucario's by a long shot.
A well designed pokemon (in most cases, not all) is defined by its silhouette. Pokemon with simple, round body shapes usually compensate for this by either being very bubbly and cute, or have interesting color palettes.
Lucario is very symmetrical and generally suffers from a lot of tangents, while Zoroark has a more wild, inconsistent silhouette which reflects the pokemon's nature.
