The books of Zhonghua Book Company are generally in ancient Chinese, without annotations, and translated in vernacular Chinese.
Books in Yuelu Bookstore are generally annotated and commented by professors from famous universities (but not translated into vernacular). For our comprehensive and in-depth understanding of the information, background and gleaning of the article, only annotations without translation can help people with certain knowledge of ancient Chinese to further improve their level (because of the vernacular, most people no longer read ancient Chinese).
Personally, I prefer the books of Yuelu Bookstore, and my Historical Records belong to Yuelu Bookstore.
If you want to preserve your value, I remember reading the New Tang Book published by Zhonghua Book Company in the 1980s in the school library. The characters are traditional, and the writing format is the same as that of ancient Chinese. It was written from right to left and from top to bottom, and it still has preservation value. ...
Of course, the most valuable ancient books all bought the same handwritten thread-bound book! ! But this kind of book is very expensive now. I've always wanted to buy it, but I can't afford it ...