One chart comparison: http://www.businessinsider.com/amazo...e-chart-2015-7

Things that stand out:
Amazon 20% growth in 2014 versus Walmart's 1.9%
Amazon 250 million products versus Walmart's 4.2 million
Amazon adds 75,000 new items every day
Amazon 244 million active users versus Walmart's 100 million customers per week

And NO rip off sales tax for me when buying from Amazon!