Brand alone is not sufficient to make a call.
EVGA have quality offerings (G2, G3, GS etc) which are made by SeaSonic or SuperFlower
HEC supply a lot of their lower-tier offerings (BV, B and their "W" series). The 600B is the best of a bad bunch from HEC, but it doesn't make it "good" by any stretch.
Corsair have the same deal. Some SeaSonic units, some Flextronics on the top end. Then they have CWT that supply the vast majority of the balance of their portfolio.
CWT have a variety of platforms though, which depend on the intended retail price/market segment they're targeting. They have some great (RMx, HXi etc) and they have some junk (like the VS, older green label CX etc).
The newer CX units are good quality. I would be much more confident in a CX550 vs a 600B.