Which Wich

In one corner, c-stores, trying to reinvent themselves and steal customers from restaurants by beefing up the quality and quantity of their food.

Among sandwich chains from the 2016 Top 500 ranking, one veteran has ignited a healthy uptick in sales, while another struggles with oversaturation.

The past year reaffirmed that tough times bring many changes in restaurant leadership. Here are four of the most dramatic shifts.