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Is there any mechanical advantage for the penta- option
No, and the lobe count isn't what makes it TorxPlus. The benefit of TorxPlus (usually six-lobe, but as with normal Torx there are 5-lobe and centre-post "security" variants) is that the stress on the engagement area is lower for a given drive torque, and there is a reduced tendency to cam out thanks to the different geometry. These are things which rightly worry people doing production engineering where fasteners are run close to their limits and need to be installed fast on a production line, but they are unlikely to concern the likes of us.
gbj_tester
@mdcc_tester
Perusing the Wera catalogue I noticed they now have bits for Torx Plus,
penta-lobed, as opposed to the hexa-lobed (normal) Torx.
Is there any mechanical advantage for the penta- option,
or,
is it just a slight security feature and a method for the screw/bolt manufacturers to make more than just a commodity return?