I had posted this earlier in another thread about discussion on the alt rewire/OEM wire.... It applies to this situation too:
Have you ever measured the volts?
1. OEM Wire only
2. OEM wire AND Rewire
3. Rewire only
I think the results of those tests will give you a better perspective on what is more helpful. (only flaw I see is that each car is different on volts, but it will still be an overall good test)
Synthetic also said it would be good to measure the volts of each wire too while they are both connected.
I don't have the rewire or voltage booster yet, so I can't do the test.... but it would be interesting to see the results if anyone measures it!
