Rolling 4 day work week

Instead of saying we should have 1 more day off as in 4+3 we could more easily implement a rolling 4+2 work week. It would almost be as much work as 5+2: 4 work days X 5 weeks = 20 2 days off x 5 = 10 vs 5 work days X 4 = 20 2 days off X 4 = 8