theravada is the first tradition and the one that use only the buddha teaching and scripture . as its the first buddhism school and the one based only on the buddha teaching, I know its a good one. theres other good schools like mahayana.
Ive seen enough people saying that they lost 20 years on zen contemplation without gaining any real result, while theravada practinonner that within one week retreat give up everything and put on the robes.
well, you didnt meditated using good methods if you meditated a lot without any results. If you meditate in the proper way, you will get results. just access concentration will bring levels of peace, calm and a deep feeling of contentment within weeks if you practice properly. but you need to know how to apply the method. most jum to fast into one pointedness and the mind cannot do it as its not ready.
a good guided meditation is from him:
https://www.youtube.com/watch?v=DgXomux53oM
The euphoria from psychadelic is amazing, but meditation is more about peace and calm, and the bliss that can develop from that is much more deep and profound as its imbued with a lot o insight into your mind, while psychadelic show you that euphoria is possible, but doesnt show you how to attain it.
read about the Jhanas, which are the goal of any meditators. the jhanas are the way the buddha find enlightenment. its been very well documented that the Jhanas are the mean to liberation. and the jhanas are attainable with meditation only. first jhana is describe as bliss, upon bliss and one pointedness on the bliss: you cannot move, you cannot think, you cannot desire or even control the bliss: all you experience is the bliss.
ajahn brahm describes very well all the meditation steps to attain those jhanas.
meditation is the science of the mind, the way to learn and look at your mind under a microscope. it helps to make your oridnary state of mind stop its usual way of being and see yourself as a whole new light:
http://www.dhammatalks.net/Books/Ajahn_Brahm_The_Jhanas.pdf
So which school of Buddhism do you think is the right one? There's thousands and thousands of different schools. How do you know you got the right one?
try it for ourself, meditate, learn to meditate, then come back to me and say it doesnt bring: peace, calm, compassion, ect.
Tried it for years - it didn't do shit.
it helps to see how we are controlled by our thoughts and how we are affected every moment by them.
I'm not so sure you need to be a buddhist to realise that tho - it's pretty obvious that we're affected by our thoughts. You don't need Buddha to tell you that.