Both of those substances you refer to are sacred spiritual plants that shouldnt be exploited for a fun time.
They are both powerful with the potential to change your life if treated with respect and honour.
They are gaining popularity with people who wish to use them as a recreational drug because they are legal.
I urge you to do some research on them from a spiritual perspective before anything.
That said, Amanita is the name of a family of mushroom, not a single variety. Amanita family includes the most deadly mushrooms known to man.
Amanita phalloides is the "death cap" mushroom and Amanita virosa is the "destroying angel". Both with give you a miserable death so be careful what you eat.
Amanita Muscaria and amanita muscaria formosa are the psychoactive variety that you are likely referring to . They dont actually get you "high" in the typical sense of the word but can provide you with some profound experiences if you know what you are doing and respect the spirit of the mushroom. Search keyword "soma" and you will find some info about what I refer to.
Both these mushrooms are in season right now and I harvest them myself. I harvested some today (formosa) and made some tea which I store for later.
Method of preparation is key since if you rush it along and dont prepare them first you will experience some unpleasant effects including heavy nausea. Most people vomit if certain steps are not taken.
Whenever harvesting these you need to do some serious self-educating first to ensure you are in fact harvesting the right variety and will be safe to consume them.
I recommend that if you learn about them and still wish to use them...simply harvest your own and prepare them. Your experience will be far more enriching and profound if you invest energy in the process.
Trust me.
Lots more I could say but Ive said a mouthful already.
Id be happy to give you more info if you like because I would like to see you get the most out of your experience.
Whatever you decide, please do it with knowledge.

peace.