I commented on the review (very nicely done btw), and after hitting both versions on a launch monitor, the basic difference for me was the amount of ball spin and launch angles. I was hitting a driver with an Aldila NV65 stiff shaft, lower kick-point and getting very high ball flight that didn't roll far and would sometimes even spin back.
I ended up purchasing a Hibore XL driver, with the red shaft stiff. The result has been more control on the height of my drives.
For instance, a typical, off the left big-toe setup hits what I would consider a "normal" trajectory, while moving the ball back in my stance allows for a lower "under the wind" drive about half as high.
The torque is how much rotation of the shaft (think ringing out a towel) is allowed. In shafts with more allowed twisting, off-center hits had me feeling the club head twisting. I don't know if the lower torque shaft I have now affects my distance, but the solid feel on impact is a confidence builder and worth a few yards.
This is my first driver with "High MOI" and all the new fancy technology, but on the monitor, it seems to me that the shafts made the real difference. I would highly recommend investing in some time on a monitor before plunking down for a new driver. Some retail stores will offer this service at a discounted or free rate is you purchase a driver.
Anyhow, thats my best estimation of the terms and how it all fits together, hopefully others will chime in and put some more perspective to it.