|>>|| No. 2830
Torx is close to mathematically optimal. The only real down-side is that a) it's quite hard to distinguish the sizes by eye and b) it's quite easy to chew up a screw head by using an under-sized bit. It's perfect for manufacturing, but slightly annoying during servicing and repair.
I've probably had the least grief with internal hex, but it's not suitable for a lot of applications due to size constraints. External hex is still probably the best option for tough environments subject to abrasion or corrosion, but those buggers owe me a lot of knuckle skin.
"Cross-head" is an absolute shit-show, because there are so many almost-compatible standards.
Pentalobe can fuck off. Tri-point can fuck off, come back and then fuck off again.
My favourite is the Pitlock, which is the only removable security bolt I've used that is actually secure. Totally niche, but invaluable if you need it.