John Corporate: "20 standards... I know, I'll create a new type of screw that will be unique to my corporate overlords and prevent users from repairing their own devices!"
Square drive on personal projects, forever and always. Maybe I'm buying the wrong torx, Phillips, and flat screws, but they strip out way too often. I've never had issues with square drive screws no matter where or how I use them
Anyone who willfully uses a slotted screw on a new project in the presence of even somewhat reasonable alternatives should have a lifetime ban on designing any items for anyone.