Which one will help out with the low end torque? Which one would you go for if you could by one? Prices are about the same.
What are the Pros & Cons of each?

Off-Road,
pro:
con:

6AL,
pro:
con:

Or: If not one of these, then what and why? with Pro and Cons

Mods(AS of Now): KN Air Intake, Gutted Cat, Thrush muffler 2.25, 2.25 tail pipe,
Mods(near future): Power chip, intake spacers, air intake system(3" tube custom bend), and TB spacer

From what people have told me I have herd that the Off-Road does the same thing as the 6
but it is water proofed and more resistant to vibration...