The main difference between a boom lift and a scissor lift is that boom lifts can extend horizontally, while scissor lifts can only lift vertically. As a result, this makes them suited for different types of jobs. A boom lift is highly maneuverable and great for access tight, hard-to-reach areas at great heights. Scissor lifts have large platforms and can handle a heavier weight capacity. The scissor design also makes the more stable, and they are typically cheaper to rent than a boom lift.