When selecting an automatic garden sprinkler system, key factors to consider include coverage, efficiency, and control features. Ensure the system can uniformly water the intended area without over-spraying. Look for systems with adjustable settings to manage water flow and coverage based on your garden's size and layout. Opt for models that integrate with weather sensors to automatically adjust watering schedules according to climatic conditions, conserving water and promoting healthy plant growth. Durable construction and ease of installation are also crucial for long-term reliability and usability.