Down or down alternative — which should I buy?

Across specialist communities like r/Bedding, the recurring theme is that real down drapes better and feels loftier, while down alternative is cheaper, machine-washable, and hypoallergenic. Reviewers repeatedly note 'there's no contest that real down is' warmer and fluffier, but many also say a good polyester-fill insert is more breathable and far easier to maintain. Pick natural down if loft and warmth matter most; pick down alternative if budget, allergies, or easy washing are priorities.