Kent,
Considering the cost of this purchase and its importance to your future, I would not buy either until I could lay them side by side, examine them and crawl into them. Fit is everything and far more important than ratings as a drafty bag is cold. Little things like do you roll over inside your bag or with your bag make a difference thats hard to figure out theoretically how each bag will work for you. Nothing has been said about how the hood fits etc, like how easy is it to get out of each when you are fully in and tightened up?

Get a good draft tube, preferably a double draft tube.
Jim