"Average" driver makes it tricky!! I drive for a living and I always say and my wife (who doesn't drive) agrees that being an "average" driver is NOT a good thing. An average Vette owner on the other hand may be a different matter as you'd think he/she'd be more conscientious of what they're doing.
All things considered, a standard is always faster. Unless you're a REAL bad driver. LOL. Then the Auto'd be faster. Then again I'm biased as I prefer a stick.
Point is with an Auto you only have to hold it againset the brake, launch and keep it straight. Heehee. though modern Auto's are getting better and better and of course if you have an aftermarket (built) tranny, um, it get's harder to define.
There are SO many variables that my HONEST answer would be a matter of which you prefer.