Usually, brake torque starts cause the rear wheels to spin while the front brakes hold the car stopped. How can you do this with AWD?

Are you talking about just putting the engine under load with the gas while all four wheels are stopped? I guess that would produce a better start.

My thinking is that the Tip will be better for drag racing (for this reason and since you won't need to replace the clutch with this kind of abuse), but I think the 6-speed will provide much more enjoyment for people who like every other aspect of driving, besides drag racing...