Yahoo is more accurate in listing backlinks, but google has more webmaster tools.

Each has its weaknesses, but Google has a much larger following when you consider Youtube and search. Google is better than Yahoo when you condiser the numbers, but I would not leave Yahoo, in the cold, when trying to improve your traffic. Yahoo is a must when trying to run an online business if you want to maximize your chances to get a sale or traffic.

Steven Dohrn