What is the best material to buy for a bookcase?

I just customized a bookcase last year using solid wood.

I think solid wood bookcase is better, the main benefits are these 2 points. One is more environmentally friendly, there is not a lot of paint, glue, so less formaldehyde; the second is more sturdy, documents. Unlike other material bookcases, such as the aluminum button board, light and flimsy, there is no sense of gravity.

Of course, there is now a kind of iron bookcase, this is now also quite good. I just heard, did not buy. Because I think it is not stable enough atmosphere, not suitable for my kind of coarse people. It is more suitable for young people, especially girls. Because the iron bookshelf is more convenient for girls to maintain and clean, the key is that it can decorate the books and walls, and the visual effect is very good.

The above is my understanding of the two materials bookcase, it is recommended that middle-aged and elderly people can use solid wood bookcases, young people can consider the iron bookshelf oh ~ ~