in the midst of studying the market and will get back to you. i will tell you that the one i want to work the most is the AI that will solve health / wellness issues, such as mental health or diseases like cancer
One of my close friends started a company, called Immunai, that is doing quite well in this area. Here is a good overview of what they do: https://podcasts.apple.com/us/podcast/ai-and-cancer-unlocking-the-immune-system-with/id1172218725?i=1000556432719