How is Noiseblocker XL2 Rev.3 in comparison to the Zalman F3 fan on a radiator?

I have XL2's Rev.2 on the MCR220 and I am very fond of them as I run them on 12v without too much noise,
but I am building an AM3 rig and for MCR320 i got the F3, however, so far I had not the time to test the fans.

Which would be the better choice with a fan controller? I know the F3 pushes more air, but at what noise
disadvantage?