the premium is not likely to pay off in durability and longevity, and handgrade uses different lasts to benchgrades, so comfort it dependant on your fit.
The soles are oak bark so those will last longer, meaning that you have to get them resoled less frequently, which both saves money and increases longevity. And while i agree that fit is the primary determinate of comfort, the HGs have far nice liners which helps too.
I've also found that the creasing on my HG shoes is much, much, much less than on my BG's. After a day or two with trees in it's virtually gone