A midweek day off sounds pretty uninteresting relatively speaking. I'd much rather have (official) long weekends--though Fridays seem to be there in a lot of informal arrangements at many companies these days.
Likewise, but I think it depends on how people like to spend their spare time. I love being able to go on a road trip or camping trip, and 3-day weekends open up an entirely new world of possibility for a weekend trip.
For people that use the time to do errands, I suspect mid-week is better. I do wish we could settle on weekends though because the errands can be easily done on Friday or Tuesday or whatever, whereas a weekend trip cannot.
I'm all for a 4-day week, as long as we all get a different extra day off. I don't need most of society to shut down for another day a week. I need a day when everything's running but I don't have to work. A society-wide 3-day weekend? That's a nightmare, to me.
In the US most retail at least doesn't shut down on the weekend today. So a lot of companies having Friday off--which I see happening informally to some degree anyway (I almost never have a Friday meeting these days)--presumably wouldn't make a lot of difference. A day off in the middle of the week would mostly mean house chores for me without a real option to do a 3-day weekend which opens up a lot of possibilities.
