| Druid is an odd choice for an example as only night elves and tauren can become one. Night Elves make good feral cats and tauren make good feral bears.
Furthermore it depends a lot on talent specs. Orcs make superior beast mastery hunters, but trolls are better marksmen hunters. Tauren protection warrior and gnome arcane mage are obvious choices. The differences are there but they really don't weigh much against skill and gear.
Anyway, there's more threads on this around.
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Sage plays a paladin,
because other classes would be frowned upon for laying their hands on a wounded companion | 
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