Carpet Experts: Nylon v. Poly?
We are building a new home and are installing carpet upstairs in the hallway and bedrooms. My builder typically installs a polyester (Shaw, Chadwick II) but the carpet guy is steering me towards Nylon. I just did some research to find out if one is more environmentally friendly but I couldn't glean that. Also, I'm now more confused about the differences between the two! Any opinions/expertise is welcome!
On a side note...I'm cringing as I research carpets because I feel like we will be walking (and laying) on chemicals! I should probably look at wool but I'm allergic to wool. Am I crazy? Any reassurance out there for me?! =)