It isn't a question of trusting China more, it is about the determination of whether China or a different government is the bigger threat. If my communication gets me in trouble it is much more likely to be with my local government than the Chinese. That and the Chinese equipment probably being cheaper and better casts a lot of doubt on whether conclusions from 5-Eyes countries are in my interests.

From that perspective it makes a big difference whether the Chinese have mostly secure back-doors or their software is just generally insecure.