Carbon is often considered one of the "best" elements primarily because it is so versatile. Its ability to form stable bonds with a wide variety of elements, including itself, allows it to create a vast array of compounds and complex structures. This versatility is foundational to the chemistry of life, as it is the backbone of organic molecules, including carbohydrates, proteins, lipids, and nucleic acids.
While carbon's presence in carbon dioxide, diamonds, and pencil "lead" (graphite) are all interesting aspects of the element, its versatility in forming numerous chemical compounds is the most significant reason it is regarded as a fundamental and unique element in chemistry and biology.