Hi snowfiend131,
Welcome to the Mattress Forum! 
The focus here of the site is not for comparing mattresses, as specifications are constantly changing and maintaining updates on the tens of thousands of mattresses available in an ever-changing marketplace would be beyond my or anyone else’s abilities (and comparisons are quite subjective), but you can see one of the more recent posts about the OMF Serenity memory foam here. You may also perform a forum search on Serenity (just click on the link) for more mentions about this item on the site. Some of the results will be for the Serenity latex mattress as well.
Overall, my comments about comparing mattresses as stated in post #2 earlier in this thread would still apply.
There are some good sources for memory foam from some of the members listed in post #21 here who are all very experienced and knowledgeable and specialize in providing the type of help and guidance on the phone that can help you make good choices. You can also look through the simplified choice thread here, as well as this thread. All of that should give you a good start in your search. I hope that’s helpful.
Phoenix