Why Google is better than Yahoo

I advertise my law firm on Google and Yahoo. By that I mean, if you search for the right words on their search engines, my "ad" pops up in "Sponsored links".I focus a lot more on my Google ads than my Yahoo ads. Google's ad program (called AdWords) is easier to use and more effective than Yahoo's (called Yahoo Sponsored Search).A couple times now I have been burned by Yahoo doing something