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Well, you guys could just test it, ya know. Here's one way that cuts out most user error:
Put the car on stands, or at least raise the rear wheels. Go into first and rev to six thousand. Get your stopwatch ready. Now lift quickly while starting the timer. Click it off when the engine hits 1000rpm. Then install the new drive shaft. Repeat the process. Do them both in the same conditions and oil temperatures. You could also do it in different gears.
Whatever way carries more mass will carry more momentum to defeat the friction and therefore will spin longer. I'd wonder if the drive shaft shop job is stronger. They claim up to 800hp. I've no idea what the stock shaft can handle. However, i did notice that the AL shaft is 3" and the stock is about 2 5/8.
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