I would say ChatGPT is still better. I get a lot of wrong answers from Gemini to the point that I use it a lot less than I used to.I switched from ChatGPT to Gemini. Generally speaking, it does give me better and more correct answers. Considering Google's index is the largest of any other search engine, it shouldn't come as a surprise.
Paid Gemini might be a different case though but the free Gemini Flash hasn't been good for me for a while.
It's fine for factual knowledgeable queries. Like randomly, I wanted know about the digestive system of some animals, about a week ago. For those kinds of queries, it is great but for anything technical, it's often wrong in my experience.