what is more performance fan?

[Abdelrahman_3]

i want to buy 4 fans 2 intake & 2 exust should i go with
1-corsair af120 performance
2-corsair af140 quiet

i care about performance noise not important)

 

[Robert Cook]

well the 140mm fan moves 3 CFM more, and is quieter, as it has more fan blade surface area, if you can fit it get it.