Corsair TX V2 series uses the Yate Loon D14BH-12 fan. Which starts up at about 1000RPM, which explains the 25dBA minimum noise specification that Corsair provides. The maximum it can go up to is 2800RPM, although it probably doesn't get quite that high even on full load and Corsair states 42dBA.
The NZXT Hale82 series uses an ADDA AD1212UB-A70GL, which in those units spins at 1100RPM in idle and goes to up 2300RPM. NZXT states a noise range of 25-40dBA.
So neither is a particularly good choice if you want a quiet unit.
The XFX units use an ADDA ADN512UB-A90. The PDF for the ADDA ADN512UB-A91 fan states a maximum speed of 2500RPM, so I believe it is the same for the A90 version. However XFX state a maximum noise level of only 36dBA.
I don't know what it's like in idle. Although I have fairly high hopes that it idles lower than the fans in the Corsair TX V2 and NZXT Hale82 units.
So if these decibel numbers can be taken at face value the XFX units are not only cheaper, but also quieter and have exactly the same performance.