The strollers made with three wheels are better for people with a more active lifestyle. They are easier to manuever than the traditional four wheeled stroller and can be better for terrain other than the straight flat sidewalk (ie better on grass, sand, crowded places, jogging, ect.). One issue is that I dont believe they come in the car seat/stroller combo that you can get with the four wheeled stroller, but really you will only use that when the child is an infant anyways.