Hi JJCNYC, glad you found useful information.
Yes, Mattress specifications can be extremely technical, which is why its’ important to have some basic mattress knowledge and determine what type of materials and mattress style you think you can do well with and are looking for beforehand, or it can be overwhelming.
One thing to keep in mind is that major consumer mattress brands like Stearns & Foster, and the retailers that focus on them are generally among the least transparent, and tend to use lower quality materials in their mattresses. Take a look at simple q&a in post #3 and some post #12 about Major Mattress Brands as well as more ‘buzz’ about marketing stories & major mattress brands
The 3 mattresses you listed – Stearns & Foster Rockwell, Saatva Classic and Brooklyn Bedding Sedona, are missing a complete list of materials used in these mattresses which makes me suspicious that there may be lower quality materials that would compromise the longevity of this this mattress regardless of the warranty offered. I wouldn’t personally buy anything unless I know what I sign up for. If you manage to find the mattress specifications you need to know especially density I’d be happy to make some comments.
Remember, the most valuable criteria are always how you and your partner feel and how long you will sleep well in this mattress. Its’ great you both have similar sleep positions, as this makes it easier to find a mattress which is comfortable for you both.
You might want to do a Forum Search to see what our members’ experiences have been with either of the specific mattresses you are considering.
I hope this helps,
Basilio