There's a negative connotation to Sorcerer or Sorcery, today, because it's used to refer to, in effect (and among other things), con men, who bilk the superstitious by claiming magical powers, too.The unfortunate problem with the sorcerer is its name, a flavor that denotes black magic and demonic spirits. ‘Sorcery’ is the technical name in anthropology for this kind of negative magic that derives from external spirits rather than from ones one self.
Which is why I'm one of the biggest advocates of "make it close to spells" and completely disapprove of any justifications of why Dispel Magic or similiar things shouldn't work on psionics.
I still feel a separate class for Psionics like the Mystic is justified, though I'm OK with other classes getting their own Psionic subclasses.
In my experience, the fans of psionics that I know are fans of the 3e Psion. This fan base cares deeply about gaming balance, and integration as a normal aspect of D&D. That said, this base tends to divide between those who need medievalesque flavor to fit seemlessly within core D&D, versus those who love the quasi-techno-babble as a distinctive flavor. I am in the normative D&D camp, so I like the name ‘mystic’.
I've never really understood the appeal of Psionics in D&D.
I much prefer this approach, although it's even better as a Sorcerer, Bard, or Warlock subclass than Wizard (Wizard already has the Enchanter).
In 3ed, Complete Arcane had the Mindbender prestige class, which I really liked.
There are no formal "sources" of magic in 5E, Divine and Arcane are entirely based in Fluff and Class abilities.Sorcerer would work best, it's already got a subclass that changes it's power source, Divine Soul's use Divine Magic instead of the Sorcerer's Arcane magic, so a Psion subclass that changes it's power source to Psionic and allows it to use intelligence as it's casting stat if it chooses could work very well.
After all Psionics are an innate form of magic.
I've never really understood the appeal of Psionics in D&D.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.