Philips drive is only good for drywall screws, because the cam-out is a feature. Robertson is ubiquitous in Canada; anything produced in or for the Canadian mar

Philips drive is only good for drywall screws, because the cam-out is a feature. Robertson is ubiquitous in Canada; anything produced in or for the Canadian market tends to use it, and Philips is mostly only found in imported products. Although Tprx is getting more common for stuff like screwing down a subfloor or a deck. I've slowly been replacing the original outlets in my 70s house, and for some reason they only used slotted drive screws, for everything.