I think there is no question for 1dba as i said go for Hyper 212.
But if look the aesthetic you can take the Hyper 412s not so much differences between those two.
My opinion is the 212 is the best CPU Cooler value for money so...
212 EVO has slightly better cooling performance, but is a little louder. What is most important to you, is for you to decide, they're basically equal.
3 months later but for future comparison, I had to look twice too..
The 412 model in the graph above is actually the 412S, not the 412 Slim.
The 412 Slim actually does a better job performance wise but is a little louder. The bigger difference between the two is the price.