I agree with EQ, the sheath has made and broken more deals for me with knives than any other.
I happen to have all the knives you named here. All are good serviceable models. Of the three I MUCH prefer the Cold Steel master Hunter. I'm not a huge fan of the current kydex sheath but its serviceable and very durable. Gerber IMHO has been going down hill in overall quality. SOG seems to be holding its own and Cold Steel continues to impress me with there different models and the unbelievable sharpness from the cheapest to the hi dollar customs.
As a matter of fact, I just bought a new Gerber yesterday. I do not know the model as nothing is marked on the blade sans the Gerber logo. Its a mirror polished 3" drop point with micarta scales, two brass pins a tapered tang and a lanyard hole. Its sheath is OK altho I'm not so sure its leather as it claims. Looks like synthetic/faux leather to me. I cannot find any pics online, but it closely resembles a loveless design.
You don't mention my favorite. Its a PUMA PAL. Not the current machine made junk, but the hand made Pumas of years ago. Its small in the hand, but big on performance, holds a edge forever and has stag scales!!
CW