as has been said the shrade steel is a wedge and a carbide sharpening tool, the gerber comes either in carbide or diamond the diamonds are of two grit, the edges or narrow sides are coarse , the flat wide sides are fine grit, and the tip is wedge shaped, i have used both when horse packing for elk , they are heavy and since i carry a 3/4 axe i don't need them for splitting. i would not carry them on a walking hunt, and since for eastern white tail i just field dress them where they are then process them later i don't need it to split pelvis in the field.
i have them both and have tried them, i don't carry them for hunting purposes. i have used them at home, not my favorite sharpener.
i have found that for field carry a small carbide sharpener that they sell t lowes in the garden section is satisfactory for burnishing an edge, it is unlikely that i would need more than this it is light and packs easily. it will reform a very dull edge or it will burnish an edge depending on how you use it and can with a light touch keep your blade sharp enough to get through several elk. the garden plus sharpener or the corona sharpener is at lowes next to the garden pruners, they also throw some good sparks off a fire steel. i had once thought about cutting one down adding some small handle slabs and making into a sparker/ sharpener for a kit.
alex