I'm guessing the chipmunk in question is Cher.
While Ace's was the heaviest, Paul's the most 'standard pop format', I personally think Gene's solo is the best of the four, musically. An oleo of rock, classical strings, straight pop, campy shtick, surprisingly good funk, 2 covers (I actually prefer his solo version of See You In Your Dreams to the R&RO cut), and plenty of guest artists.