I have the Treasure-Wise 3 in 1 digging tool which has the teeth on the left side as you are holding it. I'm a lefty so I start cutting the sod at the 3 o'clock position and pull the knife back toward me around to 9 or 10 o'clock. I see the Lesche has the teeth on the other edge, so I would think if you're a righty you would start the cut at 10 o'clock and pull it back counterclockwise to 3.
I've heard good things about the Lesche. I don't think you can go wrong purchasing one.