Toslink/optical cable recommendations

I have both the Unique Products glass toslink and the Wireworld (I think I have the 6) and have done comparisons. While the U.P is an incredible value and produces excellent sound, the Wireworld is superior in terms of sound, materials and construction. The improvement is sound is quite discernible on fine high end equipment but maybe not very discernible on routine equipment.

The Wireworld is glass.