For me to use?
Ecstasy. Because, tbh, I have tried it and it was seriously the happiest and most carefree I've ever felt in my life, and yet I didn't feel out of control like I have when drunk, nor did I suffer any side-effects afterwards.
So, yeah, if someone offered me a smorgasbord of drugs and demanded I pick one, that would be it.
For DD? I don't know tbh.