I made my own wires with large gauge fine stranded speaker wire. There may be a slight difference, but you have to check them out on a dyno. I know that Sport Compact Car has tested these, and they found that you have to move the attachment points around to find the best locations for the best power. Even so, they won't make much difference on our cars until the power starts getting up there. If you read the tests, the gains on a NA engine were a lot smaller than a hot rodded turbo car. Depends also on how good the factory grounds are.
As far as the wire goes, the Hyperground wire is probably the best out there. There are more strands in it than anything else out there and it's really good stuff. But you pay for it that's for sure. Electrons move on the outside surface of a wire strand so the more strands you have the better it conducts. When I was getting my wire at the stereo store there was some nimrod that was wiring his car with aluminum large gauge house wire! What an idiot!