When evaluating a confetti gun, prioritize the power source (manual, electric, or CO2-powered). For high-end events, CO2-powered models are preferred for their superior projection distance, often reaching 8 to 12 meters. Ensure the device features a multi-channel control system (e.g., 3-shot or 6-shot) to allow for sequential or simultaneous firing. Additionally, check for battery capacity in electric models; a high-performance unit should support at least 100+ shots per full charge to ensure reliability during live performances.