Hi dannylibs,
I think that my reply in post #2 here would be the same as my reply to your post as well. Sealy owns Stearns & Foster so my comments would also apply to them.
If you can find out the information listed in this article and post it on the forum I’d be happy to make some comments about the quality and durability of the materials inside the mattresses you are considering or the mattress “as a whole” but unfortunately it’s not likely that you will be able to find out the information you need to make an informed choice and without this information it’s not possible to make any meaningful comments about the durability and useful life of either mattress.
I can tell you based on my knowledge of the quality of the materials that all the major brands tend to use and based on many years of forum feedback and hundreds of conversations with knowledgeable retailers … you will be very fortunate to have 5 years or good sleep on either mattress and I would avoid both of them.
If you let me know your city or zip code I’d be happy to let you know about any of the better options or possibilities I’m aware of in your area so you can make a much better quality/value choice than either of the mattresses you are considering.
Phoenix