I'm biased since Vanilla Fudge was one of my suggestions, but the Breeders' cover starts off cool, but it's totally faded away after the first minute. If it kept up the intensity of the opening seconds, it would have been pretty cool. And, I love the original 'Happiness' for putting in so many moods and ideas into a 2 1/2 minute song. If the Breeders had done a little more variety...
It still would have lost to Vanilla Fudge
Breeders- 0
Vanilla Fudge- 3