My only issue with hex is that the angles between the sides are too flat and easy to round off, especially if the screw is small or cheaply made (soft steel or aluminium). Speaking from experience, if the screw head is 3mm across or smaller, Torx or JIS (which is still better than Phillips) are more reliable.
My only issue with hex is that the angles between the sides are too flat and easy to round off, especially if the screw is small or cheaply made (soft steel or aluminium). Speaking from experience, if the screw head is 3mm across or smaller, Torx or JIS (which is still better than Phillips) are more reliable.