Hi Goosey,
Post #4 here has some of my thoughts about Renelle and a forum search on Renelle (you can just click this) will bring up more about them as well.
You can see some of my thoughts about a latex/polyfoam hybrid vs an all latex mattress in post #2 here. With 2" of latex over the polyfoam (biofoam is a version of polyfoam) I would want to make sure that the polyfoam is good quality/density as well because it will also play a role in the durability and useful life of the mattress.
To make comparisons between mattresses you would need to know the specifics of all the layers and components in both mattresses and unfortunately Sealy doesn’t provide this. Latex is a very high quality material though and is the most durable of all the foam types (memory foam, polyfoam, latex foam).
You can see some of my thoughts about the Dormeo Octaspring mattresses in post #2 here.
As you can see in the guidelines here (which are also linked in the mattress shopping tutorial here) … Sealy is a brand I would generally avoid.
While neither the Sealy or the Dormeo would be an apples to apples comparison (they are both completely different mattresses) … latex is a high quality material no matter which manufacturer uses it in their mattresses and I would certainly give serious consideration to the Renelle Mattresses that use it.
That would depend on the specifics of each mattress you are considering. Latex gold uses 100% natural Dunlop which is a high quality material but is also the same material that is used in some of the Renelle mattresses so if you had one mattress that had say 8" of 100% Dunlop latex and were comparing it to another mattress that also used 8" of 100% natural Dunlop latex they would be very comparable in terms of materials and quality even if the actual manufacturer of the Dunlop latex was different (there are many manufacturers of Dunlop latex that are equivalent quality). There is more about the different types of latex and how they compare in post #6 here. Knowing the specifics of what is in each mattress you are comparing is the only way to make meaningful comparisons.
Wool and cotton are different and used for different purposes. Cotton is a fabric that is often used as a mattress cover while wool is usually used as a quilting layer (quilted to cotton or other fabrics). You generally won’t find wool as a fabric used for the cover itself. You can read more about the pros and cons of a wool quilted cover (quilted to cotton or other fabrics) in post #6 here and more about the pros and cons of a quilted cover vs a stretch knit cover in post #12 here.
Phoenix