Aluminum frames of the gazebo canopy outdoor are lighter and rust-resistant. This is an excellent choice if you need your pop-up canopy tent to be portable and/or protected against harsh environmental elements. For instance, if you plan on taking your pop-up to the beach, an aluminum frame will make it easy to carry and protect the frame from the saltwater.
A steel frame, on the other hand, is heavier but also more durable. For this reason, it is considered to be more stable. This is a great option if you will not have to carry your pop-up far to its destination and need something that is sure to withstand conditions such as high winds.