Honestly I'm always bored to hell with the depiction of other races. I don't really see the point of many of them as they are often portrait just as extreme versions of sterotypes of humans. So why play a human? Because oddly enough they are at the core of those fantasy worlds. I don't strictly play humans, but I do often as they often have more varity in their stories than the other races. If the backstory though works better with a different race I might do it, but often - meh. Most races are just tryhards and now we have people even complaining why their attributes are race specific... yeah...
To sum it up - whatever serves the story best and if all things are equal I stick to humans...