I think the best screw head is probably Torx (the one that looks like an asterix), but it's really only practical for high-torque tight-fitting fastening, like deck screws (hence its name, I'm sure). The Robertson is really all-purpose, and it's vastly superior to phillips. Plus the square head looks cool in my opinion. If only Robertson hadn't been so greedy we'd all be using his design.
Torx seems to be popping up on alot of equipment... Used to only see it on vehicles.
Makes the tool bag heavy ..
Nut Drivers -lots of 'em !
Robertson yellow green red black
Torx T5 to T40
And an assortment of slotted
The thing that's best with Robertson is it sticks to the bit ... even when upside down. I wasn't aware of any expensive copywright issues though !