I've posted before about "Torx-Plus" screws and bits. Apparently the torx features of the Torx-Plus heads and bits are made to tighter tolerances and closer fit than generic torx stuff. From the McMaster Carr catalog (about torx bits):
"Exclusively for use with Torx-Plus screws, these keys and drivers deliver up to 100% longer life and 25% better torsional strength than standard Torx tools. They also have less cam-out (slippage that can damage the screw)."
The way I figure it, you'd gain half of that using torx-plus bits with generic torx screws (or vice-versa). Not expecting anyone to order them (I haven't) - just food for thought.
Ahh - but alas - this from the wikipedia article on "Torx":
"A TORX variant, TORX PLUS, is designed to allow greater torque, and to minimize wear. Currently, TORX PLUS heads and drivers are patented, slowing adoption in the marketplace, but is licenced to a number of tool manufacturers  including Camcar  and Facom . The specifications for these licences are held by Textron. Standard TORX drivers can be used to drive TORX PLUS screws, but not to full torque because of the loose fit. TORX PLUS drivers will not fit standard TORX screws. They are shortened to 'Torx TS'."
'98 Concorde LXi - Candy Apple Red | Black chrome ring gages | Black Diamond headlights | Clear turns
'99 Concorde LX - Candy Apple Red | 16" Mille Miglia Cello Wheels | Raybestos PHP cryo-treated rotors | LHS electroluminescent gages