Different screw heads call for different driver types. Whether it be Phillips, Japanese Industrial Standard (JIS), Pozidrive, Torx, Triwing, or plain old Flathead, use the correct driver for your application.
Using a driver that’s “close enough”—such as by turning a Phillips screw with a Flathead driver—can sometimes get you out of a bind, but mostly it’s a recipe for trouble.
What’s that, you say? That sounds like a lot of drivers to keep track of? Try using a set of interchangeable bits, like the 64 Bit Kit for electronics repair or the Universal Bit Kit for larger applications.