I'll just continue where Eric left off and say that:
The BA and NO share a real close utilization curve. The BA is the smallest of the E-handles, thus lightest, and perhaps the most handy in the Combat line; however, at the cost of slightly more weight and heft, the NO provides more leverage and mass. More effecient at chopping and prying.
If weight and compactness are paramount the BA gets the nod. If ounce-shaving backpacking not the game, the NO might take the lead.
-Seth