Best Stock to Buy Right Now: Walmart vs. Costco

Walmart (WMT -0.56%) and Costco (COST -0.86%) have certain attributes in common. Both retailers have achieved great success through giving shoppers low prices. And they've rewarded shareholders handsomely over the years.They have simple businesses with management that execute very well. Both appear well positioned for the future.But which one offers investors the better opportunity? WalmartSince opening its first discount store more than six decades ago, Walmart has remained focused on keeping costs down an ...