What is the best webbing buckles: Polypropylene, Nylon or Polyester?

Tie Down webbing buckles Comparison Tie Down Property Polypropylene Nylon Polyester Overall Safety Poor Fair Excellent UV Protection Good Good Excellent Water Resistant Excellent Fair Excellent Break Strength (subject to change) Poor 700 lbs. Good 2,500 – 7,000 lbs Excellent 2,000 – 10,000 lbs. Abrasion Resistance Poor Fair Excellent Fiber Stretch Poor 50% Fair 20%-30% Excellent [...]