Hi cpcrn,
There is more about the different types and blends of latex including organic Dunlop latex vs 100% natural Dunlop latex in post #6 here.
If the two materials (organic and 100% natural Dunlop) are the same thickness and ILD there would be little to no difference in their feel and performance, durability, or harmful substances and VOC’s since they are basically the same material. The GOLS organic certification also covers other areas though besides just the material itself (such as sustainability, and fair trade practices) so whether the organic certification was “worth it” or not would really be a personal choice depending on how you feel about the other criteria that are involved in organic certification besides just the quality, performance, or safety of the material itself.
Phoenix