OT: Since You Been Gone - Head East vs. Rainbow

Back in 1978, a band called Head East released a song called "Since You Been Gone". It didn't get as much exposure as it should have since they weren't very well known except in the Midwest USA. A year later in 1979, a band called Rainbow with a much larger fanbase re-recorded the song, and their version became more popular due to the broader audience that it reached. The radio stations were even playing both versions for a while after the Rainbow release.
I never could figure out why Rainbow ripped the song off from Head East, because I liked the Head East version much better and I saw no reason to redo it (especially with John Schlitt singing... that's as blasphemous as redoing a Steve Perry hit and giving the cloned version more airplay than the original).
What about you - which version do you like better? Please make your decision based on the audio only, because the Rainbow version actually had a video made for it.
Head East version: http://www.youtube.com/watch?v=XJKZL1EKpdY
Rainbow version: http://www.youtube.com/watch?v=TYtdW5bD-7Q

I never could figure out why Rainbow ripped the song off from Head East, because I liked the Head East version much better and I saw no reason to redo it (especially with John Schlitt singing... that's as blasphemous as redoing a Steve Perry hit and giving the cloned version more airplay than the original).
What about you - which version do you like better? Please make your decision based on the audio only, because the Rainbow version actually had a video made for it.
Head East version: http://www.youtube.com/watch?v=XJKZL1EKpdY
Rainbow version: http://www.youtube.com/watch?v=TYtdW5bD-7Q
