There is info in this old thread.
I've used 4708 for 20+ years, but never tried the 4719.
The 4708 (26 gauge) is a bit more brittle than some of the other 20/22/25.5/26 gauge solid core copper wire I've tried.
In my case the wire has been broken (@ the speaker post) a few times by one of our cats.
I noticed that one speaker was "out" upon playing source material and shut the source gear off with no damage to amp transformers.
Aside from that it's been fine for a couple of decades.
I started out with 12 foot runs to the living room speakers and would guess that they are down a foot, or two, @ this time due to exposing fresh ends.
If you want to experiment with something on the cheap try the Neotech solid core CU/Teflon wire in 22, 24 or 26 gauge.