Simmons and King Coil mattresses have quite different properties. Both manufacturers are well known. The products of these manufacturers have suitability to different consumer needs and budgets. To an extent, the pricing differences between these manufacturers reflect the cost differential between advanced sleep surface technologies vs. traditional mattress technology.
There's even the Energy Foam Base Layer included in the Del Aire Plush King Mattress. Get a great night's sleep on this Simmons Collection King mattress, and rest easy with a 10 year warranty.