With the challenges of rapid urbanization, enhancing urban smartness and resilience has emerged as a critical pathway for fostering high-quality urban development. Research indicates that various resources-including human, capital, technological, social, policy, and natural resources-significantly influence the development of urban smartness and resilience. However, the mechanisms underlying their coordinated impacts remain unclear. To address this gap, this study constructs a scientifically robust and comprehensive evaluation index system using bibliometric analysis and the CRITIC-TOPSIS method for systematic assessment. Furthermore, it employs Necessary Condition Analysis (NCA) and Combinatorial Regularity Analysis (CORA) to explore how resource inputs influence urban smartness and resilience development in megacities. The study reveals two key findings: (1) policy resources are particularly critical for enhancing urban resilience, while capital resources play a pivotal role in advancing urban smartness; and (2) there are two distinct pathways for the development of urban smartness and resilience: the “human-social” developed system and the “capital-natural” developing system. These findings deepen our understanding of the complex interplay among urban development resources and provide actionable insights for promoting context-specific, high-quality synergies between urban smartness and resilience.