The other points I see hear are great- some other quick pointers
shielding- Foil offers 100% interference rejection, but can break after a while if setting-up and breaking down, as in portable/stage applications- best suited for permanent studio installation. Braided copper offers around 95% usually, but can withstand heavy physical usage all day long- great for portable applications, or if moving around a lot in the studio.
construction materials , such as die-electric material, can affect noise-ratio and performance specifications, such as capacitance, measured in pF/ft.
Another thing to consider is conductor configuration. For an instrument/guitar cable, for instance, there really are only a single conductor plus a ground conductor (braided shield can double as ground) required, so a coaxial cable, like Canare GS6, is great, IMHO. However, some prefer a twisted pair for an unbalanced cable- partly subjective opinion. A microphone cable (and some instrument outputs) is a balanced cable, and requires two conductors plus the ground. Canare L4E6S is a quad configuration for balanced lines- two pairs of conductors, each twisted and then soldered together at the connectors. This configuration further increases rejection of Radio and Electro-magnetic interference, as it helps distribute exposure. For this reason, Canare L4E6S makes an excellent balanced line, IMHO.
Neutrik makes very well-constructed, durable connectors, with great performance. Gold contacts are especially resistant to oxidation with exposure to the elements, so is particular good for outdoor and stage/portable applications. Silver contacts are great for studio use.