If you want to read and understand the vernacular and read the classical Chinese at the same time, you can choose the following vernacular contrast, Zhonghua Book Company Edition.
Don't even want to read classical Chinese, don't think too much! Then directly pure white version (Yuelu Bookstore Edition).
If you need someone to read it in a relaxed and bright tone, then read Xiong Yi's version of Purple Tongzhi Sword.
Readers who have a relatively good foundation in classical Chinese, but don't like traditional classical Chinese, can choose the simplified Chinese version of Hu Zhu and Kao Yi.