MDAi is somewhat too mild to match MDMA's intensity, 6-APB is getting pretty close but has a more psychedelic feel to it. I do feel 6-APB has more music appreciation than MDMA (Might be because of the psychedelic effects), but MDMA has more empathy and euphoria.
The closest you can get to MDMA at the moment is 5-MAPB in my opinion.