You did not mention brand, but the most basic of these are very similar. Construction is typically coax, with copper or copper plated center conductor, surrounded by foam dielectric and a shield of copper braid or aluminum foil.
The best cheap cables of these types is made by Belden and available as component video and / or audio cable.
For component video, Belden 7710A coax (a three-conductor version of 1694A), or audio, Belden 1505F. Both support RCA connectors.
There are differences when you leave this basic design and go with audiophile cables such as Cardas, Purist, Nordost and the rest. Whether the performance gain warrants the investment is up to you.
The best cheap cables of these types is made by Belden and available as component video and / or audio cable.
For component video, Belden 7710A coax (a three-conductor version of 1694A), or audio, Belden 1505F. Both support RCA connectors.
There are differences when you leave this basic design and go with audiophile cables such as Cardas, Purist, Nordost and the rest. Whether the performance gain warrants the investment is up to you.