I’ve heard far more people using it for helping with simple coding exercises and helping them approach coding problems than I have heard of people using it for research.
I wouldn’t be doing much of any research through AI for exactly that reason myself. It hallucinates too much.
So, like I said, it depends on what you’re using each one for. People seem to be having success with Bing and programming, but less so with Bing and anything actually human-life related.