Pros choosing Aftershock over Aery as Support Lux runes, but why ?

Lux Runes 9.11 | LoL VVV
Lux Runes for Patch 9.11 based on professional matches. Check out which Runes are used on Lux by the best players.
Hello guys, I want to add Lux to my championpool, because it seems like Lux becomes a legit support more and more. If I check for [Lux runes]( from the pro scene, they pick Aftershock most of the time. Can somebody tell me the benefits of Aftershock in comparison to Aery ? It just make no sense to me. Thanks in advance THE STONEBEATER {{champion:516}}
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