I only use Warm & Natural. I am very , very happy with how it holds up to washing, and how it drapes. I don't find it stiff at all. I have never used polyester, because of the bearding issue, and also because I feel it is too stiff and too puffy.
I have seen the breakdown of costs on the bamboo batting. Some people say it's the Green Alternative...that's not really true. The chemicals used on it are toxic, the processing part negates any green advantages resulting from the fast growing bamboo. It's all a marketing ploy!!! Don't fall for it!!