I haven't tried all of them, that's why I mentioned in the videos to take up the time to research them yourself.

I can only do so much sweetie.
When you're researching PPC networks, you need to pay close attention to the quality of the PPC network in regards to the visitors you receive. If you get lots of visitors and hardly any clicks to justify the hits, then you need to bid your keywords down a notch to level it out, cos if your CTR drops in adsense, you could risk having the account closed.