TechCIDLC :
Corsair's best line of PSU: Corsair AX
EVGA's best line: SuperNOVA
SeaSonic's best line: all of 'em
I ultimately recommend you to go with the M12II 750W.
Your generalizations are useless.
Corsair's best series is the AXi Series with all models made by Flextronics. The AX1500i has 80 PLUS TITANIUM Certification and is their best model, period.
There were a lot of customer complaints about Seasonic's X-Series models having coil whine. The Corsair and XFX models that were based on those same X-Series platform models also suffered from the same coil whine complaints. If you're building an Intel Haswell system you shouldn't get a Seasonic S12II Bronze Series PSU.
EVGA's models that are made by Super Flower are the only ones that I would recommend.