Sustainable materials are materials with qualities which reduce the environmental impact during their life cycle.
Green building materials offer specific benefits to the building owner and building occupants; first of all, sustainable materials improve occupants’ health.
Besides this, green materials reduce maintenance costs over the life of the building. Another advantage of green material is the energy conservation.
Sustainable materials minimize the possible effects of toxic and hazardous substances on human health and they support the recycling industry.
For these reasons, I think that eco materials are better than traditional materials, in fact traditional materials may be toxic or difficult to recycle.
I know a sustainable materials and this is the most common: timber.