Should you invest on a proven winner or potential turnaround?Investing in the retail sector can prove challenging, particularly during uncertain times. Consumers and retailers face various economic challenges, including an uncertain tariff policy.However, it's important to look beyond the recent turbulence. In fact, it could create a buying opportunity for long-term successful retailers that maintain a competitive edge.Walmart (WMT -0.49%) and Kohl's (KSS 0.91%) have been moving in opposite directions. But ...