As Volkswagen AG seeks to replace discredited Chief Executive Officer Martin Winterkorn, the leading candidates range from a decades-long veteran of VW to a pair of newcomers who have been with the company less than a year. Winterkorn resigned Wednesday after revelations that the company cheated on diesel emission tests and may face criminal charges in the affair. The new CEO will take charge as VW seeks to regain the trust of consumers and rebuild a brand tarnished by scandal.