1. Easy to operate: choose four steps. The ladder is low in height, easy to go up and down, and does not need too much strength and steps. The shorter four-step ladder is more convenient for people who frequently go upstairs and downstairs when moving.

2. Convenient storage and carrying: Compared with the five ladders, the four ladders are smaller and lighter, and easier to store and carry. When there is not enough storage space or the ladder needs to be moved frequently after moving, it is more convenient to choose a smaller four-step ladder.