Hi luxasteraea,
The first place to start would be the “read first” post and the overviews and other posts it links to. This will give you some basic information to scan through (not “study”) about what the information means so that you can ask more meaningful questions when you talk with each manufacturer or retailer you are seriously considering. Your questions are very broad but are mostly answered there and in the descriptions of each mattress on their site.
Dreamfoam and Brooklyn Bedding are one of the invited members of the site which means that I think very highly of them and the quality and value of the mattresses they make and sell. They are certainly one of the sources I would recommend and are among the best quality and value available. Most importantly they are transparent and knowledgeable which means that they will give you accurate information about the materials in their mattresses and will also help “educate” you about the differences in terms of quality and feel between them and which may be most suitable for you.
As you can see in post #2 here … I’m happy to help with “how” to choose and to help you eliminate the worse options and help you connect with better retailers or manufacturers but “what” to choose will depend on following the steps and links in the read first" post I linked and one of the most important parts of this is your phone conversations with each of the retailers or manufacturers that you are considering. They are more knowledgeable about their specific mattresses and how each of them may compare to each other or fit the needs and preferences of each person than anyone else including me. As you can imagine … for me to do what they are better at than I am (educating you about their mattresses) would be outside the scope of a forum or the time limitations available to me. The knowledge, experience, and transparency of a retailer or manufacturer is one of the most important parts of a mattress purchase and a conversation on the phone with them will be much more meaningful than someone else trying to describe their mattresses on a forum.
A forum search on both the Cotton Caress and the Bamboo Bella (you can just click these) will bring up more information and comments about them but the best source of more specific information is a more detailed phone call to the manufacturer themselves.
This of course would make local shopping more difficult and the greater risk of online options more attractive. Feel is very subjective and relative though and when you are shopping online then again … the manufacturer will know more than anyone else about the relative “feel” of each of their mattresses and which of their models may be more suitable for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) based on your body type, sleeping positions, and preferences based on the “averages” of their customers that seem are similar to you. Don’t forget I’ve never slept on any of them and feel is so subjective and there are so many variables and unknowns involved about how a mattress will “feel” that other people’s experiences in terms of “feel” may be very different from your own.
I’m certainly happy to talk about the quality of materials (which they can as well) or help you make meaningful comparisons or narrow down your options so all your final choices are between “good and good” but a more detailed conversation with a high quality/value manufacturer that you are seriously considering is always one of the most important steps and of course if you have more specific questions where you have any trouble finding answers then I’m happy to share my thoughts as well 
Phoenix