I'm US based and I've been taking things apart for 25 years. I've seen hex, torq, hell nintendo used those weird Y screws for a while. Had to google Posidriv and I've never seen one of those used here. Everything is Phillips.

I've never heard of Pozidriv before, but reading about it on Wikipedia it says "They can be unscrewed with a regular Phillips screwdriver". So it sounds like Phillips screwdrivers are still quite useful.

It "sort of" works. A Pozidriv screwdriver will have better grip and if you apply too much force the PH screwdriver will possibly destroy your PZ screw head. (And vice versa).

Good to know. For context, as an American, I've definitely seen Pozidriv screws before (without knowing that they were a distinct screw type from Phillips), but there's also plenty of Phillips screws here too. I'm not sure offhand which is more common here.

Based on my immediate WTF IS POZIDRIV mental response, it must be another America/Europe thing. In my day-to-day American cheeseburger life I need phillips, flathead, maybe hex, and maybe torx. I carry a Victorinox Cadet because I cannot feel it on my person and it has the first two plus the pretty alox scales.

uk here. not sure i've ever seen a phillips screwdriver. we just use posidrive, but call it phillips all the same. i'm not old enough to remember pre-metric though.