Disregard psychoactive and videogame mushrooms. What's your favorite edible mushroom?
I'm partial to Pleurotus eryngii (also known as king trumpet mushroom, French horn mushroom, king oyster mushroom, boletus of the steppes, trumpet royale). Might just be that I've not had it that often yet, and I really dig new flavors - texture-wise, it's a bit on the chewy-side of things, but offers a unique tangy flavor in return. Can't quite describe it, you've got to try it for yourselves.
Mushrooms are amongst my favorite foods. They have replaced meat for the most parts in my daily diet. My preference for lowheat cooking is a great fit for shrooms - I love when they retain most of their liquids. Like biting into a fluffy cloud of heaven. Yummy!