To get knowledge it's advisable to cross check the answers provided by ChatGPT or other AI Chat Bots. My personal experience with these AI chat bots is that at times the answers given by them needed fine tuning. There are online resources which are considered reliable (not every website has authentic information), it's better to check them also rather then solely relying on AI Chat Bots answers.
With code its different because you can easily figure correctness of code by checking whether your code is giving desired output or not.
It's very necessary to say that your ability to explore the best part of these chat bots is how best you can arrange your questions and prompts, if you know how to generate good prompts, you will get good responses. I have tried DeepSeek too like I tried ChatGPT, and ChatGPT still offers a better interface design and smooth response. DeepSeek may probably be more smarter in giving response at the barest minimal of question twisting and intelligence, but it is still important for DeepSeek to work on their interface to enable easygoing activities particularly in terms of formatting of texts and responses.
ChatGPT platform is generally stable and its interface is simple and stylish, in my opinion it is a few steps ahead of Deepseek. In terms of Privacy and Data Usage, I can put both of them in the same bag, there is no difference in this regard.
People have formed certain habits in Chatgpt usage and I think that the majority of users are satisfied with this situation with the data they have collected so far.
I do not think that users who are satisfied with ChatGPT will prefer DeepSeek.