The choice between smart contract languages like Solidity and Sui Move carries significant implications for security, performance, and cost. This paper presents a practical, code-driven comparative analysis of these two paradigms, evaluating their core architecture, security models, empirical performance, and ecosystem maturity. Our findings highlight a fundamental trade-off: Solidity offers rapid development and a vast ecosystem at the cost of developer-managed security, while Sui Move provides robust, language-level safety and on-chain efficiency at the cost of a steeper learning curve. We synthesize this analysis into a practical decision framework to guide developers in selecting the optimal language for their project, balancing priorities like speed-to-market against the demands of security-critical applications.