Mainly consider which aspect of the news you personally favor, the two sites are positioned differently (as follows)

Caixin: Caixin is located in the original financial new media, 24 hours a day, 7 days a week, original content output, for the Chinese government, academia, and industry elites to provide daily economic activities necessary for the financial information and basic financial information services.

Caijing.com: Founded in 2008 by the editorial team of Caijing, Caijing.com is a financial and securities stock portal. It provides a full range of original news and analysis articles for readers who want to get a glimpse of major financial news at home and abroad. The website continues the editorial philosophy of Caijing magazine, and is an original, high-quality and reliable financial news website that is updated in real time every day.