There are a few different types of Amanita muscaria mushrooms. I have tried most of them and the best trip I have ever had was from the Amanita muscaria (Washington) Grade A shrooms. They contain only caps which is very important for your health, and are very potent. Here is an excerpt from Arena Ethnobotanicals: "Washington Fly Agaric (amanita muscaria) are mushrooms which contain the chemicals ibotenic acid and muscimol and are the oldest entheogen known to man. These Washington Amanitas are hand picked, then dried. The Washington Fly Agarics are best known for their distinctive dark red appearance and yellows with white spots. These Washington Amanita Musacaria mushrooms are taken to special drying chambers 170-200F. This process turns some ibotenic acid into muscimol, which is believed to be the most active."
Amanita Muscaria trip description, dosage, and preperation