There are several different ways to measure market share for search engines and here’s another view and another data point that indicates Google, while losing some share to Bing, is still the number one search engine choice by a wide margin.
The point here is that if you’re trying to help your retailers choose the best way to spend their money locally, local search is the best ROI ever. Then, if you want to tell them where to spend their money in search, Google is the first step. And, if you want to add the ability for your retailers to create AdWord campaigns and landing pages in your online ad builder or if you just want to provide them with campaigns, get it right on Google first and worry about the other search engines when time and budget permits. But, get Google local going right now!