chatGPT is more for asking questions.. IMHO, I haven't really seen it solve anything that Google won't anyway.
However, Copilot is basically a really advance autocomplete. So, if I write something like function LinkedList.Init() it will try and fill in the gaps. Whereas, in the past, I might have gone to stack overflow for basic algorithms
It used to be total rubbish, but these days its good for a lot of smaller things.
Depends on your use case though. But, I just haven't seen the need for ChatGPT at all for what I'm doing (but stuff which is more natural language like journalism, or product summaries, it might be more useful).
Also, on an unrelated note, Dall-E SUCKS at generating Logos (it can't even generate text)
I I have been programming with Matlab for 8 years and am switching to Python. I'm focusing on deep learning applications and have been using ChatGPT to answer general questions about Python as interactive documentation. Would you say Copilot would be better for this use case or only better when I am a bit more advanced with Python?