Panaflo L1A or Acoustifan 80mm?

[fanerman91]

Which is quieter at a given CFM? (or which has a better CFM at a given dB)

I have Panaflos with a fan controller (I can just manually speed them up when I want to play a game or whatever) so I'm wondering if it's worth it for me to cough up another $17 for the Acoustifan. All that really matters is CFM/dB ratio. And if it's close I probably won't bother...