Is real down or down alternative better?

Reviewers across the sources we read generally agree real goose down offers superior loft, drape, and warmth-to-weight, while down alternative (polyester microfiber) is cheaper, machine-washable, hypoallergenic, and easier to live with. Hot sleepers and people with feather allergies typically lean alternative; cold sleepers and shoppers prioritizing longevity tend to lean down.