Hi Stephnell,
The first thing I would suggest is to clarify why you are looking for an organic mattress. There are many people who shop for organic mattresses when what they are really most concerned about is buying a “safe” mattress. Of course for others an organic certification is important to them for personal reasons. Post #2 here from yesterday may be well worth reading.
Comfort is always subjective and based on preference so it would depend on each person’s individual preferences and perceptions. The best way to decide whether any mattress is comfortable to you is based on your own personal testing and experience. Wool is a more resilient and “springy” natural fiber than cotton so it can feel softer and “packs down” less but it’s also more costly than cotton. Neither one will tend to be as soft as foam materials.
Phoenix