If we are talking about food and culinary recipes, I will say that my favorite mushroom would be shiitake, but about
medicinal mushrooms, there are many of them, and it all depends on the condition you are treating, but my personal favorite will have to be dried reishi and you can see about them on the site that I put above. I came across this website and the topic of medical mushrooms purely by chance when I was traveling (when we were still allowed to do that), and I was in China for a few weeks.