Depends on the cut you want. If you wand a deep aggressive straight penetrating cut, grind the out side. If you want a cut you can dip into and out of making a concave cut. grind on the inside.
In a whittling away from the body, inside being bevel toward material to be cut, out side being flat toward material to be cut. In a food prep on a cutting board situation inside ground will be bevel toward the off or material holding hand, outside will be flat toward the off hand. Did that make any sense?
I have made and used loads of katashinoge (bevel on one side or one ridge-line) ground blades over the years and don't have a preference for general use. In the kitchen, for chopping, or in a sword I prefer outside ground.