I've worked at Kmart and Meijer. Here are my experiences at both:
Kmart
Less emphasis on credit cards (Sears Cards), but extremely high emphasis of the loyalty program, Shop Your Way Rewards. If you didn't maintain the % of loyalty sign-ups, or % of loyalty customers, you'll be performance'd out in short order. There was less management involvement with the frontend, and only high-volume stores had a front-end lead. Depending on the store, the frontend was disorganized mess, and you hoped you had a manager who cared. In most stores, the service desk person acts as the front-end supervisor, so it was difficult to manage cashier calls, breaks/lunches, and other things that would fall to a GSA at Target while manning the service desk, processing returns, helping out with lottery tickets, Western Union, etc. Register system was slow as hell. Bottom Line: Overall, less expectations then Target with metrics, but can be tougher due to supervisor duties combined with running the service desk. However, Target wins because Kmart only pay minimum wage, and Kmart will probably go out of business within the year.
Meijer
The only metric that really mattered was cashier speed. The company was unionized, and you receive raises based on the number of hours you work. Hours and days off based on seniority (which can be a bad thing at first, but turnover is high enough that cashiers can achieve seniority quickly. Cashier supervisors receive an additional 25 cents per hour, but only when working as a supervisor, otherwise you make your regular rate of pay. Cashiers supervisors mainly ensure that lanes run quickly, speed-weave, assign breaks and lanes, grab change, and process cash drops for cashiers. Management is involved with frontend operations, but like I said, cashier speed is really the only important metric. Bottom Line: Meijer was a good place to work, especially with the raises once you hit certain hours worked milestones. I only left because I was using it as a second-job and they continually exceed my maximum hours per week requests. The only thing that sucked is that you only got the additional supervisor pay when you worked as a supervisor. Overall, good company, as long as you don't mind the $10 union fees deducted from your check each week, and the $100 union fees every year.