When equipment faces intense vibration—such as in aerospace, electric vehicles (EVs), or oil & gas applications—the choice of spring energizer becomes mission-critical. Vibrations can not only destabilize sealing pressure but also lead to premature fatigue, relaxation, or outright failure. In this article, we compare helical springs and canted coil springs under high-vibration conditions, exploring their strengths, limitations, industry applications, testing standards, and practical design guidance.