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I used to think of Torx as the best until I met a French Canadian who dared me to use Robertson (square).. I did, now I'm all Robertson. The screws stick to the bit before putting them in and always come loose after. Torx acrews often sticks to the bit when they're in. I also seem to need less of a variety of sizes compared to Torx. But hey, I'll take Torx over Philipps any day.. Not sure why those are still around.

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Robertson is much more prone to camming out, especially when trying to remove them after they have been in place for a while and a little gunk builds up in the square.

Is that not the case with torx? I could suppose not.

I've been using Robertson but I don't often build stuff.. yet..

For star drive, the force is transferred between the walls of the bit and the walls of the screw flush against each other. Like with gears. This leads to minimal wear and allows for wide tolerances and sloppy angles between bit and screw.

Square bits on the other hand drive the edge of the bit against the wall of the square hole. The edge can cut a circle into the screw, and the square head gets turned into a circle by wear. Thus required tolerances are much lower, and screws don't fall off the bit. If they did fall off you'd know to change the worn bit.

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