Hi wr4ngway,
Thanks for the update. I’m sorry to hear that your mattress only lasted you for a year. It sounds like it was on the edge of being too soft for you so that even a relatively small amount of foam softening was enough to take you outside the comfort/support range that is suitable for you (see post #2 here).
The Brooklyn Bedding BestMattressEver would certainly be a great quality/value choice.
I would think that the medium would feel firmer than the Obsession but when you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using (fast or slow response, resilience, firmness, motion transfer etc) and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs and firmness levels to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else.
Phoenix