I work both. In summer, we switch to 4-10s. Both have advantages I’m not yelling I’m a Missouri girl we just talk loud Betty Boop shirt. You can schedule appts on days you are off during the week and still feel rested if you get a 3-day weekend. It does help companies keep their workforce at work, as appts and other things can be done without having to take time off work to go to them. The trade-off is that you are on the clock working very long 4-days to cover the 40-hours on the clock.