Natural materials are correct
I think it is always best to make things as natural as possible, simply because I think natural materials fit in with the environment much better, and this is true in the garden as much as anywhere else. Because of this reason I usually use Wood Fencing because I think it fits in with the natural environment very easily, while also being very secure and making the garden look really nice. It is a great thing to have something that blends in with the environment so well that you hardly notice it is there, I would recommend it to anyone.