How about this, I'll describe the kind of Environment that the world around you transfers into when you take each of the Psychedelics you just mentioned...
Mushrooms/Psilocybin - The will bring about a very strong feeling of Oneness with Nature, realizing that we are all as much a part of this Planet as every other Plant or Animal. I tend to think a lot about God, and Religion and how misled people are thinking they need something to believe in - when in reality, the Earth provides for all of us and takes care of all of us - you just have to learn how to re-pay her with Love to have a good life and Nature will always look out for you. There are some weird forces in this world that are unseen that most would say are lies or don't exist, but it's just because they've never had the pleasure of experiencing these beautiful things, so they refuse to allow themselves the thought that such magic could actually exist. Psychedelics are the closest thing to "Magic" on this planet. Respect them ALWAYS my friend.
LSD - I think that every human being should eat LSD at least one time in their life. It's a drug that helps teach you about Yourself, what YOU want out of life, and it can help you realize if you're someone who has low self esteem....it can help you find your Inner Ego, and I don't mean it'll teach you how to be an Arrogant Dick..........it shows you the talents that you possess and that you should be proud to have and use to your full advantage by allowing to see yourself and your Ego from outside of your body. I notice a lot of people on high dose LSD talk about having the experience of feeling like they're hovering over themselves from outside of their body, just observing their own behavior and take on life. It's a VERY liberating experience, that's why people "occasionally" just decide to get naked and run around - you just tend to realize a little bit more than normally JUST how free we are as Humans to do whatever the FUCK we want with our existence, for good or bad. LSD is beautiful, and while I enjoy Mushrooms - they can take you to a WAY deeper mental spot, WAY quicker than LSD. To get to the same trippiness as 2.5-3.5 grams of average 'Shrooms, you're looking at eating around 4-7 hits of common Street Acid, if your getting real LSD at all. ALWAYS KNOW YOUR SOURCE FOR LSD, there are A LOT of imposters these days. Fake LSD is usually NOT FUN.............and ALWAYS ALWAYS ALWAYS, keep some god damn BENZODIAZEPINES on hand, Xanex, Valium, Klonopin, Etizolam, Pyrazolam.......something of this sort. They can literally SAVE A LIFE when a trip gets too deep, they're like an Escape Hatch out of the Trip. Keep them around, they WILL save you one day when you get too out there. It happens to the best of us, so don't EVER be embarrassed of something that you think about while tripping. It's just a part of who you are, deny it or deal with it, it's still a part of you. Psychedelics are like a Mental Organizer, helping you put life in proper order by importance. It's quite amazing. I give LSD 4 out of a possible 5 Psychedelic Stars. Mushrooms get more like a 3-3.5 out of 5. It kind of hard to get up and do shit on Shrooms, they tend to be very lazy and just Melt into Your Couch like, whereas LSD is usually more active, it has a slightly speedier edge and is a little less intense on your mind and body. High dose mushrooms have literally made me feel like I fucking poisoned myself before. Always remember, EVERY TRIP IS DIFFERENT, EVERYTIME, even if it's the SAME DOSE of the SAME DRUGS. Every trip is BRAND NEW, so leave your old ways of thought at home.
Salvia - I've actually never tried it personally, but have read and heard plenty about it. This one is more of an "Acquired" taste you could say. Some people freak the fuck out on it, others feel quite heavenly. It's a Dissociative, my favorite class of Drugs, in the same family as Dextromethorphan (DXM AKA, ROBITUSSIN), Ketamine, PCE, PCP, Methoxetamine, there's a lot of them nowadays. They offer their own unique state of Psychedelic Bliss - usually a very Stoned and Drunk at the same time kind of feeling with a little bit of LSD thrown in. They are some of the most Intense drugs, so know what you're getting into. All dissociatives can take you to their own version of a "Hole", basically a place where your brain ceases to be capable of understanding the most simple of signals being sent to it. You could look at a chair, and instead of seeing a chair, you'll think "What is this Wooden Object in front of me with 4 feet, a Flat area, and Backing on it - I have no clue what the fuck this thing is for." That's a pretty good example of how Abstract your thought process can get. It's kind of beautiful really, but can be TERRIFYING if you aren't ready for it and don't go with the flow of the trip, whether you like it or not. That's actually a good point about tripping on any substance - IF YOU DON'T LET GO OF YOURSELF ENTIRELY, IT MAY RESULT IN A FRIGHTENING TRIP, A BAD TRIP, Or just not what you were looking for at all. YOU control the destiny of the Trip, the drug is just a Catalyst put there to amplify your own thoughts that are already present. LET GO my young trippers, it's only then that you can Experience the true beauty inside of us all!!
DMT - Probably the MOST intense Psychedelic on the Planet. You WILL leave your body entirely. You WILL forget what kind of life form you are. You MAY talk to Aliens or see other incredible Life Forms in the room with you. FOR REAL. It can be TERRIFYING if you aren't ready. I'm an EXPERIENCED Psychedelic user and the first time I smoked some 5-MeO-DMT, it felt like taking off in a Rocketship to Outerspace - it made me so anxious because I was holding back that I almost gave myself an Anxiety Attack. I started reaching for my bottle of Diazepam QUICK - but before the Valium had even kicked in, I had already adjusted to my new state and was perfectly fine. DMT is BEAUTIFUL, it's like taking a full blown 12 hour HIGH dose of LSD and condensing it into 15-30 BEAUTIFUL minutes. If I was the person who got to give DMT it's first nickname, I would've called it Angel Dust - because you truly feel like a piece of Heaven just came into your living room on it.
MDMA/MDA - I've taken this plenty of times, but I'm not really a huge fan of rolling. Because of this, I'll let someone else describe it to you so you can have a good time and make the decision on your own. MDMA isn't really scary, unless you take too much, and then it can be a bit much - but overall, it's kinda like a Psychedelic Opiate high, you feel super happy, want to be everyone's friend, your super sexually charged and outgoing - it makes it pretty easy to get laid if you're around a lot of single women who are looking as well. It's an odd substance, very unique. Some love it, some don't. Decide for yourself. It's still a worthwhile tool to check out and see where it fits into your life.
Enjoy and stay safe my friend. Feel free to ask anything, anytime. I want to be here to help me fellow, less experienced users keep themselves safe. Have fun - Mr. Meowfish