Mid Lane: 21/0/9 vs. 21/9/0
Every high elo korean player uses 21/0/9 masteries when playing champs such as: ezreal, leblanc, kassadin, jayce, orianna, etc. The only time they use 21/9/0 is when they use zed. They don't go for runic affinity but for biscuits. For some reason Koreans think sustain is everything in lane. While on the other hand, I never see NA or EU players go 21/0/9 on any mid laners.
They also take a point out of somewhere on the ability tree in masteries (cdr or ability per level) for butcher and feast.
As far as solo Q goes, I still believe 21/9/0 is the best way to go since as a mid laner at almost every elo you're expected to snowball your lane yourself. That means dueling and the extra 40+ HP and defense is a lot more beneficial for dueling.
Your thoughts?