My impression is that the AI overview sucks and the AI mode is pretty good.

Often they give diametrically different answers to questions and in those cases the AI mode is usually right.

It can be way better with your own "deep research" agent that does not insist on writing a half baked report, the main idea is that they can make multiple searches and sift through results. It can be instructed to be very concise or to write a long ass report, your choice.

This is my custom MD kb tool with this feature

https://github.com/verdverm/gmd