Early civilizations recognized that loose soil results in a bountiful garden.
Modern-day gardeners and landscapers are ditching their shovels and spades in favor of a more mechanical method.
Rototillers will significantly reduce the physical toll of weeding or digging a garden.
You should choose based on what you're looking to accomplish. Tillers dig new gardens, but cultivators mix and blend the soil - usually with added amendments like compost.