<p>Achieving effective hydrogen storage remains a major challenge, but compounds rich in hydrogen are seen as strong candidates for high-capacity gravimetric storage. This research evaluates the hydrogen storage performance of metallic, intermetallic, and complex hydrides. It highlights which types and specific compounds within these groups are most effective for practical hydrogen storage. Additionally, a short comparison was conducted to examine how hydrogen storage capacities vary with molar mass. Metallic and intermetallic hydrides typically have limited hydrogen storage due to their higher molar masses and strong metal hydrogen bonds. In contrast, complex hydrides tend to offer much higher storage capacities than elemental or intermetallic counterparts, making them especially attractive for applications that require substantial hydrogen content. Additionally, a comparison underlines how molar mass, chemical composition, and structural features collectively affect hydrogen storage performance. Overall, the review outlines the strengths and limitations of each hydride category and suggests potential strategies for developing lightweight, high-capacity hydrogen storage materials.</p>