It's not as much a question of better as it is of different. natural fibers are often nicer to the skin, while sythetic fibers can be stronger, more long lasting etc.
Although put together by humans, the parts of cement are natural. Cement is a fine, soft, powdery-type substance. It is made from a mixture of elements that are found in natural materials such as...
An OAK TREE is natural. It grows from an acorn and the wood is used for many purposes. Oak COLOR is usually manufacturedOak SCENT could be natural or synthesized.