Different colors require different dyes and dye processes; some are more caustic than others. This is often the reason why different colors of the same thread break in different ways.
I recently took a class from Jamie Wallen, who uses polyester thread (his fave is Isacord) almost exclusively for quilting. He said that many museum curators have told him they have beautiful quilts in storage that cannot be shown because the cotton quilting thread has dry rotted. (Old quilts are often stored in less than ideal situations -- attics and basements -- and this facilitates dry rot.) Polyester thread used for quilting will actually last longer than cotton thread, especially under less-than-ideal storage conditions.
Rayon is not a good thread to use for piecing or quilting because it does not wear well over time.