Just know that compact models often compromise on features like noise reduction and capacity due to their smaller size. Size and CapacityFor most households, dishwashers generally come in two widths: the standard 24-inch and the compact 18-inch. A 24-inch model is usually the best choice for families, having enough room for bulky cookware and larger loads. Noise LevelOne of the biggest differentiators between modern dishwashers and older models is noise, which is measured in decibels (dB). Soil sensor: Detects how dirty the water is during a cycle and automatically adjusts wash time and water usage.