There's more than one reason for thinking about buying a lawn tractor. First, if you have a huge property, a riding lawn tractor makes quick work of trimming large grassed areas. Second - they help take the physical work out of mowing your lawn.
Price determines the size and the number of features in a lawn tractor. For lawns under two acres you can consider a light-duty lawn tractor powered with a rear engine. If you're dealing with areas larger than that, a commercial-duty zero turn mower is the way to go. A front-wheel drive lawn tractor is a practical choice for level ground. Rear-wheel drive tractors are more efficient for handling uphill or side hill areas. In these cases, your front tires won't lose traction. You can find all-wheel drive mowers to handle a wide variety of terrain.