Electric vacuum pump vs. EVAC

Hi Guys!

I'm building a 390 only for race and i would discuss about a crankcase evacuation system.
I know that mechanical vacuum pump, like Moroso will give the best results, but to me is too expensive than i'm thinking in two other options:
1 - Moroso Crankcase evacuation system conected to the headers($55,00);
2 - GM electric smog pump running counterclock($80,00)

First of all, Anyone using those systems?
which system pulls more vacuum?

Thanks a lot