Bobby Darin sounds positively square next to Ben E. King. The first thing I noticed is that in the chorus, Darin resolves to the root of the tonic chord. King drops down to the third, which sounds a little hipper. King phrases behind the beat and takes some liberties with the melody, adding drama and strengthening the narrative voice. Darin sounds relaxed, but rather unimaginative, although it's probably just as well he doesn't plead like King.