Chosen Solution

Metric vs. Imperial Screwdrivers? Which should I buy? I’m in the market for new tools, which will fit/be easier to use, Thank you for dealing with the “dumb” question.

iFixit Precision 4 mm Screwdriver Bit

If you will be working with a wide variety of equipment get both. Imperial is common in North America amd metric pretty well the rest of the world though because of the size of the American market you will find Imperial outside that region.