The best share trading services prioritize low commissions, robust, easy-to-use platforms, and extensive research tools. Discount brokerages like Fidelity or Interactive Brokers are popular for both beginner and active investors, often offering $0 commission stock trades. Advanced traders may prefer specialized platforms with complex order types and detailed analytical data. Always evaluate a service based on its fee structure, customer support, and the range of investments it offers to ensure it meets your specific trading needs.