Not sure how you can say for sure Google is better if you haven't tried YPN.
I run both, mostly on different sites but in one case through thorough testing I found that YPN works better on some pages of a particular site while adsense works better on other pages.
In general, the payout for YPN is better but it's very inconsistent. They're clearly somehow "playing with the numbers" as far as payout. Annoying, but in the end, the one that earns me more money wins.
And it's great to have options... especially when you get stung by "smart pricing." That happens and I head straight over to YPN.