Most hollow grinds are sabre grinds. For a general-use folder, if it's between a sabre-grind hollow or sabre-grind flat, I'll almost always pick the hollow. But my fave overall is usually a full flat grind. If you're going to do a flat grind, do it all the way to the spine; if the grind only goes a little ways up the blade, you gotta go with hollow.
Joe