Best fans I ever tested for noise vs air-flow on radiators was the Scythe S-Flex F, and fit them to a resistance (ie. not PWM) based fan controller.

The Sharkoon Golfballs I found to be quite noisy for the performance they offered in comparison.

I'll see if I can dig up some of my old test data, but I distinctly recall the Scythe SFF's pretty much owning the stage at every level up to their peak rated voltage.

Here's some data graphs of the Scythe SFF's vs the Sharkoon Golfball's vs the Yate-Loons

Scythe SFF



Sharkoon SE2000



YateLoon