They are all you. The only thing that actually does the work is you. Certain 'techniques' will appeal to certain personality types but ultimately what they are doing is providing you some focus or structure to actually sit still and be present with yourself, which is the only thing that does anything.
To say one technique works and one doesn't is meaningless. It's all you doing the work and maybe you thrive on the structure or you don't. You have no idea how it will resonate for someone else - for plenty, to just sit and 'reflect' can't last for more than 1-2 seconds without immediately drifting off and the task focuses them.
The one 'clinical fact' about something like EFT is that if you are dealing with something that has a real trauma, having some physical touch or something that engages the body conclusively shows a massive difference. Again this is for something with physical trauma associated with it.
A real teacher will tell you that. If someone is telling you no, it's my technique that fixes you, because of some magic power in the technique itself (which inherently implies a robot or monkey could recite the words / tap the points / whatever and it would work the same) you are dealing with a salesman. I knew I found my first real teacher when he told me all of it was me.
Whatever method it is it will have to be dropped eventually. This includes self-inquiry as the imaginary difference between 'myself' and the 'me who is sitting here with myself and confronting it' begins to break down