Hi jhcoleman18,
It’s not uncommon that people love a hotel mattress when their own mattress isn’t suitable for them any longer. There is more about hotel mattresses in post #3 here but they are a frequent reason for buyers remorse when a buyer discovers that they may not feel the way they did in a hotel when they sleep on it at home.
It’s probably an approximation of one of the older low/mid range Posturepedics that used an offset coil system but unless you know the specifics of what is in the Marriott mattress and a mattress you are considering there is little chance that you will be able to compare them or approximate the Marriott mattress. You would also need to know the specifics of any mattress pad or topper in the bedding package they used with the mattress because this is a big part of the “feel” and performance of many hotel mattresses including the Marriott (see here for the current topper or featherbed they use). About the closest you could probably come would be to find out the type and number of coils in the innerspring in the Marriott bed you like and then find a Posturepedic that has a similar innerspring and coil count and a similar type and amount of padding above the innerspring but it will be guesswork at best and it won’t be easy to find out enough information about either the older Marriott innerspring or a current Posturepedic you are considering to come as close as you hope to.
Unfortunately … there are just too many unknowns for me to suggest anything more specific outside of testing some of the current low/mid end Posturepedic lineup with an offset coil (like the Posturepedic Classic SS coil here) that “feels” close enough that you believe adding a featherbed or topper that was similar to the one you slept on would end up being close to the mattress you remember. As you can see this won’t be an easy task and there is no certainty of success for someone who is as sensitive to different mattresses as you are.
Phoenix