Hi The Riddler,
You can see some comments about the quality and durability of the materials in the Myrbacka mattress in post #2 here and in post #2 here. A forum search on Myrbacka (you can just click the links) will bring up more comments and feedback about it as well.
It has a thicker layer of synthetic (about 6" at last check) and a higher quality base foam (2.2 lbs) and also has a wool quilted cover.
Overall, yes, this mattress would possess higher quality materials than the other two mattresses you mentioned.
Phoenix