Van Halen - Best of Both Worlds
The live version of this from the Live Without a Net video was played like crazy on MTV, and I liked it quite a bit. I never heard the studio version until years later, and when I did, it was a massive letdown; very sterile and lifeless in comparison, IMO. To this day, Best of Both Worlds isn't close to being a favorite of mine, even from the Van Hagar era, but when I do listen to it, I go for the live version every single time.