Recent studies have shown that both tigers and lions play significant roles in maintaining the balance of ecosystems, but tigers might have a slight advantage. Tigers are "umbrella species" that protect entire ecosystems, support scavenger birds, and contribute to forest health. They also regulate water systems and sequester carbon. Lions are equally important, but they primarily control herbivore populations and maintain savanna health. Both big cats are vital for biodiversity, but tigers' broader impact on forest ecosystems gives them a marginal advantage in ecological importance.
Source: MSN