Better for what?

A stretch bolt ( Torque to yield ) is used when maximum clamping force is needed. Torque readings only infer clamping force and can be affected by thread friction. Head shape can be anything.

Torx only refers to the type of head. These are typically where space is a issue / tamper resistance is needed. Allen bolts used to be used in these apps but have limited resistance to stripping the head. The torx spline shape took care of this.