Zoomer115

I recently bought a POD XT live and a 700 Acoustic I have noticed that the Variax cable and the powered 1/4" cable via the A/B switch sounds very different.\ I have also observed that you cannot run the Variax cable and the 1/4" cable output at the same time. The Variax cable sounds much closer to real Acoustic sounds and the 1/4" is very tinny... What is the differences/ Advantage of using the Variax cable except being able to use Workbench to modify the 700 Acoustic settings ?