Related to the thread "cover versions you didn't know were a cover"; this is about covers you did know were covers, but are better than the original (although that's always a matter of personal opinion of course, this is just mine, feel free to offer yours).
"Hurt", originally by Nine Inch Nails. This is their official video.
It was covered by Johnny Cash; I believe it was the last song he recorded. This is his official video. For my money, it's a better version. What's your view?