Which search engines is best for PPC advertising

We all know that there are 3 top search engines available online Google, Yahoo and Bing. Because 95% of the searches is made by these three search engines.

But In starting we have to start our campaign with that search engine which is mostly use by the people for searching and PPC advertising. I have seen that plenty of peoples uses Google for PPC advertising because the user chain of Google is huge and everyday plenty of users comes to Google for searching his desired term. In this respect Google is the good choice for PPC advertising. Here, I am not say that Yahoo and Bing are bad search engines.But In starting we have to use only best search engine for PPC advertising and then expand to other sources when they are needed.