Soeaker cables technologic dilema…


We have two technological solutions when it comes to speaker cable: 
 
1. Four wires (2 on + and 2 on -), twisted in a star quad, in a screened braid and in one collective insulation.

2. Second solution: two SEPARATE double-wire cables, one for + and one for -, but without shield. 


The number of cores, core cross-section, material, weave, both in NES-3003-G and NES-3005-G everything is the same. 
 
In the first solution we have a screen, and in the second solution we have a separation of plus and minus. 
 
How will it be better? What to expect?
milimetr

A shielded speaker cable? I've never seen such a thing in a home installation. To what would the shield be grounded?

Can be grounded, can be left unconnected. 
many top-level speaker cables uses some kind of shielding. 

Can be grounded, can be left unconnected. 

To what would you ground a speaker cable? What would be the purpose of an unterminated  shielded cable?

many top-level speaker cables uses some kind of shielding. 

Oh? Examples, please.