To choose the perfect outdoor fountain, consider your space's size and style. For smaller areas, opt for compact, tiered fountains, while larger gardens can accommodate grand, multi-tier or sculpture-based designs. Think about the material—stone and concrete are durable, while metal and ceramic offer elegance. Consider the sound of the water flow; gentle trickles are calming, while louder splashes create dramatic effects. Choose a fountain that complements your landscape, whether traditional, modern, or whimsical. Additionally, ensure easy maintenance and weather resistance for longevity, and think about the power source—solar-powered options are energy-efficient and eco-friendly.