User blog comment:Fistful of Force/Why I believe dedicated supports are better than AP supports/@comment-8656854-20131124205140

You can argue any support is better than another if you pick situations that benifit them.

Leona is better than X because in this situation we needed a tanky champion.

Sona is better than X because in this situation we needed her aoe CC ult.

Fiddles is better than X because in this situation we needed a silence that hits more than one champion.

Zillean is better than X in this situation because the ADC is about to take fatal damage.