These are common questions often asked. I have my preference but that does not make it a good pick for the client. I look at the carpet fiber first. Will it last? Will it wear for a life time and not ugly out? Bottom line, I am at a point in my life where I can appreciate the old adage: It only costs a dollar more to go first class.
There are a number of great sites that will answer these questions honestly. I highly recommend if you are buying carpet to do some research. Please don’t forget that a carpet salesman is a salesman. I have given two links below that are both great. Spend some time and determine what would best meet your needs then see what kind of a deal the salesman can give you on your chosen fiber.