Plastic bookcase: plastic is a synthetic material. Although light, most of them are harmful to the body and easy to be scratched and damaged.
Metal bookshelf: The advantage of metal bookshelf is durability, but the biggest problem is its own weight, which makes moving and handling a big problem. Even hollow frames are much heavier than cabinets made of other materials.
Glass bookcase: the glass material itself is fashionable and beautiful, and the visual effect is good. There is no environmental protection problem that other bookshelves have to worry about. However, the glass bookshelf has a big disadvantage that fragile fragments are easy to hurt people, and there are many non-fragile ones, such as plexiglass and tempered glass, but this kind of glass is mostly used to build or make small quilts, and this kind of bookshelf is quite expensive. From a practical point of view, it is not recommended to use glass, but if you make decorations, glass bookshelves are still a good choice.
Wooden bookshelves: Wooden bookshelves are the most common bookshelves, among which there are many materials, such as plate and solid wood. Common wooden bookshelves are mostly MDF, which is not as good as solid wood and has high density, but the cost is not high. The solid wood bookshelf lies in its texture and beauty, but it is more expensive. It is not recommended to buy other wooden bookshelves, because there are great environmental risks.
So from the above analysis, wooden bookshelves are better.