Originally Posted by Fast-Ford
Going from a stop is far better than a roll because it puts a lot more responsibility on you to make sure that A: you can drive, B: you have a good traction set up, and C: you have good tires.
I agree. Overall, its better to go from a stop.
On the other hand, I also love 2nd-gear or 3rd-gear only runs, starting at 10 or 20 mph. I feel it gives a better idea of the car's true power, since both low end torque and high-end HP are both shown in their full glory. This is a little different than say, a drag strip, where top end makes much more of a difference.
Just an off-topic .02 Why not try both?