I linked the review for the Thermalright, here's the accoustic performance graphs:
From the review:
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As you can easily notice, Thermalright TY-140 fan is way quieter than Noctua NF-P14 FLX. And the difference is so significant that at the level of acoustic comfort when both fans produce the same amount of noise the difference in rotation speed reaches 200 RPM in favor of the Thermalright solution. From the subjective prospective I would also like to point out not the low level of noise from TY-140 that much, but the pleasant sound it makes: it doesn’t rattle, crackle or whistle. There are no acoustic parasitic additions of any kind. At up to 800-850 RPM we can only hear the sound of flowing air creates by the fan blades. In other words, while Thermalright Silver Arrow didn’t really outperform Noctua NH-D14 that much in cooling efficiency, but when it came to acoustics, Silver Arrow was indisputably on top.
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I've used a few different Thermalright heatsinks before (not this one, but one of their previous supercoolers) and I really like them.
Silent PC review comments:
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Our experiments with the two stock fans suggests that the 14cm fan is doing most of the cooling work, although the 12cm fan is very helpful at lower speed with a red-hot CPU. Depite all the features to reduce noise and improve airflow, the Noctua fans are not exceptionally quiet. Their tonal aspects are sometimes intrusive, and their ultimate noise-to-airflow ratio is not remarkable.
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http://www.silentpcreview.com/article1020-page9.html
For not super overclocking though you'll be able to crank down the fan RPMs on both so you probably can flip a coin. The Thermalright is a bit cheaper.
I don't mind spending a few bucks on a great cooler as well as I usually keep them across 2 or 3 processor upgrades as well.