Well, I have little use for daggers so I won't comment on the Desert Dagger. The Government model I've always liked. It's got a reasonably thin blade and nice edge geometry. And I like the flat metal pommel for hammering. SOG uses 440-A, which isn't the best edge-holder in the world, but SOG (or rather their contractors) has been reputed by several sources to be pretty good at heat treating 440A to reasonable edge holding. The Government doesn't have enough weight to be a chopper, but it'll be a good solid slicer.
Joe