They are easy to install, aluminum is heavier, and stronger than metal ones. Some camera tree mats made in metal are heavier and stronger than others. Depending on the needs of your customers, they should be able to choose the ones that reflect the image or want of the image.
Most camera tree mounts are lightweight, easy to install, and can bestanded from a variety of materials. Metal camera tree mounts are lightweight, easy to install, and wall-mounted. However, metal tree mounts are heavier, and less easy to install than a wall mount.