Which school's "organization" you prefer the most? European or American one?

5 days allows for more constructive afterschool activities(assuming that's what you'd do when not at school). With 6 days you have a huge interuption in most days which makes it harder to plan things. That and extra days ends up creating 1-3 hours of preparing and moving to/from school in which a lot of productiveness isn't ussualy happening.