Two 140mm case fans or three 120mm?

Feb 14, 2014
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So the air 540 from corsair comes with two 140mm as default, i want to replace them with LED fans, and it can mount 140mm fans, but two of them, or 120mm and three.

three 120mm fans obviously costs more but i don't care about that,

which is strictly better? For exhaust there's a 140mm on the back and there will be either two 120mm or two 140mm on the top (with a radiator from a CLC)

thanks!
 
Solution
Two 140mm. It will shift about the same amount of air on total, and produce less noise because they spin at a lower rpm.

Also less fan headers required, and less power cables means a more clutter-free interior.