I have different favorite mushrooms for different reasons.
I would say the Destroying Angel is my favorite because that's a badass name for a mushroom. It's named appropriately, as it will certainly destroy anything that attempts to consume it. The name destroying angel is applied to Amanita Virosa(Europe), Amanita Ocreata & Amanita Bisporigera(North America). They're not exactly the most beautiful of mushrooms. They're just some basic white bitches but their name and deadliness does it for me.
As far as appearance, I love the Amanita Muscaria. Especially the gold ones. It's the first mushroom I ever noticed in the wild as a child.
And then as far as my favorite mushrooms to put in my mouth, just the standard Psilocybe Cubensis
Oddly, I can't stand mushrooms in terms of culinary types you'd put on food. If you wanna ruin a pizza or some spaghetti sauce or literally any dish, just toss some mushrooms in there and I'm pretty bummed about the whole ordeal. The first dozen or so times I ate boomers I would just fight throwing up the entire time until I'd eventually throw up. I didn't feel any better, I'd still be sick to my stomach for the remainder of the experience. It was generally pretty awful until the day I decided I'd try to grind them up real fine and blend them into tuna.
If anyone has a hard time keeping mushrooms down but you're not vegan/vegetarian you should give tuna and mushrooms a try. The overpowering flavor of the tuna completely neutralizes all of that dirty-sock-tea flavor the mushrooms have. I think it also gives your stomach a more gentle hit as it isn't just a handful of toxins landing in your gut but rather this blend of food to slowly digest that just happens to also have ground up toxins in it. It's kinda like the difference between guzzling down a bottle of everclear vs slamming a fruity mixed drink.