As with any lawn and garden tool, purchasing the right tiller and cultivator depends on what type of projects you plan to undertake. A tiller or cultivator is a major investment as garden tools go, so ask yourself the following questions before you buy.
To the extent that cultivating is done commercially today (such as in truck farming), it is usually powered by tractors, especially row-crop tractors. Industrial cultivators can vary greatly in size and shape, from 10 feet (3 m) to 80 feet (24 m) wide. Many are equipped with hydraulic wings that fold up to make road travel easier and safer. Different types are used for preparation of fields before planting, and for the control of weeds between row crops.
Many backyard gardens are pretty small and simple and going for a large rear-tine tiller would be overkill. But if you tend a particularly large garden, trying to make do with a cultivator will make the work slower and leave you feeling frustrated.
It sounds like an obvious point, but the size of your garden determines how big of a job soil mixing and tilling is each season. A tiller of some sort will be helpful for any size of garden.