Yeah, I know there's probably a historical difference between the two but in media the two are pretty much always identical.
I mean even Psimon despite being a "classic psionic" is literally just a telepath and telekinetic like any other DC psychic.
The only real difference is the extent of what their psychic abilities do which will vary in the media. The stronger ones generally "making phenomena".
Her name was Esper Lass, not Girl. She was not a member of the LoSH, but she had applied and was rejected because she had the same powers as Saturn Girl. (She was a resident of Titan like Imra.) She joined the Legion of Super Rejects and later became a member of the Legion of Super Villians, at least according to Wikipedia.
https://en.wikipedia.org/wiki/Esper_Lass
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Saturn Girl is a really powerful psychic, but she's mostly dangerous to her foes because she's just like... ungodly pragmatic?
"Oh no worries about the witnesses, we'll just do mind-wipes."
JFC, Imra! But I still love her though.
"You know the deal, Metropolis. Treat people right or expect a visit from me."
Post crisis Brainiac mostly just played mind games but his power level was high enough to run through the New Gods. That's a pretty big feat I think.
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Just what IS Brainiac's deal anyway these days?
Bringing him up reminds me of Panic In The Sky where Maxima pits her telepathy against a Warworld boosted Brainiac and does quite well. That makes me think the top 3 are Maxima, Saturn Girl, and Jonn Jonzz thanks to to his League appearances especially as written by Mark Waid and Joe Kelly
Manchester Black seems like he's tops in DC for both telepathy and telekinesis.
Rumbles has MB as a real tough foe for even Marvel's Professor X to beat in sheer TP.
Where is Starro, Mr.Mind or Despero? They have to be on another level.
Jemm Son of Saturn, Psimon, Maxwell Lord, Doctor Destiny, Hector Hammond, Mento, Looker, Manchester Black, Dubbilex, Doctor Psycho
Lilith, Gorilla Grodd, Martian Manhunter, Hector Hammond, Brainwave, Jemm Son of Saturn
Women
Faith
Looker
Maxima
Ms Martain
Omen
Saturn Girl
Tomorrow Woman
Men
Brain Wave
Captain Comet
Immortal Man
Mento
Phantasm
Templar