Not saying its an absolute thing for all black cables but all of the black jacketed Morse cables that i have purchased from Rex Marine have a stainless steel cable and are priced significant higher and last much longer than the red cables.
Same shit different manufacturers...
Red is no longer really a thing and they were the best IMHO. Morse were red, Teleflex were black.
It's now called Teleflex-Morse.... There are two different versions, brass and stainless, this refers to the end tubes... They last about the same in our applications. Stainless steel is normally reserved for salty environments, but the cost difference is negligible...
JMHO
GT