From someone who does not have EE installed, I look at it this way. Silver is insanely valuable to me. I need it to make blue alloy ingots which I use for wires, motors, pumps, batboxes, ect. As well as solar panels. I end up eating through stacks and stacks of it when I am working on a project. Redstone on the other hand is even more valuable. It is not only used for wires, but for many important mod items as well. What is valuable to me most, however; are diamonds. Since I cannot simply pull them out of a creative menu (or rather condense them out of thin air), I go with the silver recipe. It is just two more cables but every diamond counts.