Flatheads are really easy to make(cut a slot) and at larger sizes are good for easy open things since you can use a screw driver or a key or a coin to turn them. They’ve largely fallen out of favor as they’re not good for bulk manufacturing of items
Phillips is more complicated but still very common in households so it gets used a lot. Its nice that its self centering but has a tendency to slip out if you apply too much torque so its still not a great screw head
Torx is the one true drive. No slippage, crazy high torque values, and no fiddly alignment required, but a lot of people don’t own a set of Torx drivers yet so they’re not used for things like Ikea furniture
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