One advantage of a vertical band saw is that it:

A vertical band saw is designed with a continuous loop of blade that moves in an upright position, allowing for a variety of cutting techniques. The primary advantage of this configuration is its ability to cut not only straight lines but also intricate curves. This flexibility is particularly valuable in woodworking, metalworking, and other materials, where precise and intricate shapes are often required. The blade's design and the saw's construction make it ideal for achieving complex cuts, which is a significant benefit for projects that demand creativity and detail.

The other options highlight limitations that do not accurately reflect the capabilities of a vertical band saw. It's not confined to straight cutting (as indicated in the first choice) or limited to wood materials, as it can effectively cut a range of materials including metal and plastic. Additionally, while the cost of a vertical band saw might be competitive, it is not universally less expensive compared to other saw types. This saw's versatility in cutting curves is what makes it a popular choice in many workshops.