Quoted:
one is flat ground the other is hollow ground-- whats this mean? is
one better than the other?
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Flat Grind:
The flat-ground or "V ground" blade is one of the most basic edge styles in existence. In a flat-ground blade, both sides taper toward each other at a consistent angle from the spine of the blade to the edge, where they meet.
Flat-ground knives have a distinct advantage in that they are possibly among the easiest to maintain.
Hollow Grind:
The hollow-ground blade gained popularity in the hunting and sporting community in the late 1950s. It has a distinctive concave grind to the edge, so that both sides of the knife have a bevel that bows inward until they meet in a thin, sharp edge.
They are not the most durable edges, and proper maintenance needs to be performed more frequently by stropping or sharpening. Buck hunting knives, straight razors, and a number of custom knives make use of this thin and extremely sharp edge.
Maintenance of a hollow-ground blade is not difficult, but must be performed often.
All that said, the ESSE would be my choice.