Choosing the right pool cleaner involves considering several key factors. Here are the top 5 rules to guide your selection:

1. Type of Pool: The first rule is to consider the type of pool you have. Inground pools and above-ground pools have different requirements. Additionally, the material of your pool (concrete, vinyl, fiberglass) can affect which cleaner is best suited.

2. Size and Shape of Pool: The size and shape of your pool dictate the cleaning power and reach needed in a pool cleaner. Larger pools may need more powerful and efficient cleaners, while smaller or irregularly shaped pools might require cleaners with better maneuverability.

3. Type of Debris: Assess the common types of debris your pool collects. If your pool often gets large debris like leaves and twigs, you'll need a cleaner that can handle that. If it's mostly dust and smaller particles, a cleaner with fine filtration might be more appropriate.

4. Automation and Ease of Use: Decide if you want an automatic or manual pool cleaner. Automatic cleaners, like robotic pool cleaners, require less effort but are generally more expensive. Manual cleaners are more affordable but require more physical work.

5. Budget and Maintenance Costs: Finally, consider your budget not only for the initial purchase but also for ongoing maintenance. Some pool cleaners are cheaper upfront but may have higher maintenance costs, while others might be more expensive initially but cheaper to maintain in the long run.

Remember, the best pool cleaner for you will depend on your specific pool characteristics and cleaning needs.