Cocoon by Sealy Chill vs Siena Signature: Which cheap memory foam mattress should you buy?

On the left, the Cocoon by Sealy Chill Memory Foam Mattress on a bed frame in a bedroom, some cushions piled up at the head of the bed. On the right, the Siena 10" Signature mattress on a bed frame in a bedroom, some pillows placed at the head of the bed.

Cocoon by Sealy Chill

Type: All-foam
Firmness: Medium-firm
Height: 10"
Sizes: 6 (twin to Cal king)
Sleep trial: 100 nights
Warranty: 10 years
Price (sale) From $399 at Cocoon by Sealy

Siena 10" Signature

Type: Memory foam
Firmness: Firm
Height: 10"
Sizes: 7 (twin to split king)
Sleep trial: 180 nights
Warranty: 10 years
Price (sale): From $179 at Siena