Is it better to chat by voice or by typing on WeChat? Will voice chat be discovered by others?

This depends on your habits and hobbies, there are various occasions. If it is a more formal occasion, it is best to chat in words, or when others are inconvenient to listen to the voice, it is best to send a text. If you are chatting with someone you just met, it's best not to send a voice. Typing can keep a certain mystery.

And if you are chatting with friends or family, the voice is more intimate. Also, if someone sends you a voice, you should try to reply to him in words. After all, typing is a very troublesome thing.

As for what you said, voice chat will be discovered by others. This is actually possible. After all, if a person often doesn't make a sound, first of all, he must be sure that he is introverted and has no confidence in his own voice. From his voice, he can hear his personality, including his mental state and the seriousness with which he treats things. Anything is possible, so if you chat with people you don't know very well, you'd better send a text message.