The "best" rattan pool sunbed factory depends on your needs (wholesale/retail, quality/value), but top players often include manufacturers in Vietnam (like ATC Furniture) and China (Foshan region: Kingmake, Darwin, Sunward), known for large-scale production, while brands like Harmonia Living, Sunset West, and Hospitality Rattan offer quality for direct buyers, focusing on durable PE rattan and sturdy frames for resorts or high-end residential use, with key factors being frame material (aluminum), UV-resistant wicker (PE rattan), and cushion quality. 

For bulk/wholesale, focus on large Chinese or Vietnamese manufacturers like ATC, Darwin, or Kingmake; for retail quality & design, brands like Sunset West or Harmonia Living are strong contenders, but always verify the use of durable PE rattan and strong frames for pool environments.