Hi Heyphoenix,
Most of this is explained in post #1 here and the links it includes.
A mattress is only as good as the quality of it’s construction and the materials inside it so once you know the specifics of a mattress you are considering you are in the best possible position to make meaningful comparisons with other mattresses based on the criteria of your own personal value equation. Your question is too general to answer in specific terms and would require re-writing much of the site in my reply. If you have two mattresses where you know the specifics of what is inside them and can provide all the information about the layers and materials inside them I’d certainly be happy to share any thoughts about them. the short answer is that I wouldn’t consider any mattress where you don’t know the specific details of all the layers and components inside it.
You need to know the thickness, type, and density of all the foam layers. If 2 lb foam is memory foam it’s really poor quality and if it’s polyfoam then it’s good quality.
This uses much higher quality materials (latex is one of the highest quality and most durable foams). You can see some of my thoughts about the iChoice in the more detailed discussion in this thread.
This isn’t all the layers in the Telluride but the specifics of the layers and components is on their site and in post #8 here and my thoughts about it are in the reply that follows in post #9.
There are no obvious weak links in the mattress and it has good quality/value although I would test it carefully for PPP (Posture and alignment, Pressure relief, and Personal preferences) because it’s a soft mattress and may not be suitable for everyone.
I personally wouldn’t consider any mattress (such as the Comforpedic) where all the information about what is in it wasn’t available.
Phoenix