Is the screw going to slip out while I’m screwing it in or out.
Do I have a screwdriver or screwdriver tip for that screw when I need it.
Criterion 1 eliminates the flat head and Philips points. They’re terrible because they slip out. The flat head not only slips out, it slips out in the most dangerous ways.
But, criterion 2 eliminates most of the other designs. Even if you’re Canadian, which means you do have a Robertson screw driver, you might not have the right Robertson bit. Unlike with Philips or slot, the size of the bit really matters.
Ikea does a great job of handling this situation because they mostly use hex screws and bolts (which are great), but they also supply the required driver with the parts (which is necessary because many people don’t have a tool to tighten hex bolts).
IMO the only two criteria that matter are:
Criterion 1 eliminates the flat head and Philips points. They’re terrible because they slip out. The flat head not only slips out, it slips out in the most dangerous ways.
But, criterion 2 eliminates most of the other designs. Even if you’re Canadian, which means you do have a Robertson screw driver, you might not have the right Robertson bit. Unlike with Philips or slot, the size of the bit really matters.
Ikea does a great job of handling this situation because they mostly use hex screws and bolts (which are great), but they also supply the required driver with the parts (which is necessary because many people don’t have a tool to tighten hex bolts).