Zeison Sha are #1 in all things ever and could beat anyone anywhere anytime, just name the place bro come at me brah!
__________________ Recently Produced and Distributed Young but High-Ranking Political Figure of Royal Ancestry within the Modern American Town Affectionately Referred To as Bel-Air.
Joking aside, how do you rank them? Or at least the ones you're familiar with.
Here's my listing:
Jedi
Sith
Legion of Lettow (Not Sith, kinda precursors, huge schism of former Jedi that almost brought the Jedi to their knees)
Imperial Knights (good numbers, weren't confined to a single planet, has a lot of masters)
Witches (really a bunch of sub-organizations, but they're both very plentiful and have produced a lot of strong individuals. Top of the 'single planet' groups)
Fallanassi (while not militarily very strong, their illusions are awesome, and useful even in fleet combat. Kinda hard to rank due to being so specialized, but the Emperor specifically targeted them for heavy purging and they managed to escape and survive without having an easy hiding place, which is pretty awesome)
Zeison Sha (Limited to a single planet and good fighter, but still wary of the Empire's hunters and unable to kick the Empire off planet)
Jensaarai (started out with a combination of limited Jedi and Sith training, but developed into their own thing and did cross-train with Jedi to bring their level up. Not bad fighters, but the One Sith were able to bully them reasonably easily)
Baran Do Sages (Only so low because they're primarily seers, not military, but they do have some fighters among them, and members who were also Jedi, including no less than Plo Koon)
Sorcerers of Tund (Supposed to be pretty good with their 'spells,' but they were wiped out where the Jensaarai and ZS survived)
Matukai (While individually pretty good fighters, they were tiny, a very small order)
I'd put them as number 1. Wasn't Abeloth a fake One, and weaker than the other Ones? Memory is kinda fuzzy on FOTJ. No other force users can duplicate their feats. Likely not even entire organizations acting as one.
__________________ "You must begin by gaining power over yourself; then another; then a group, an order, a world, a species, a group of species... finally, the galaxy itself."
- Darth Plagueis
"She may be small but she packs a punch and when shes in this mood...she goes for my danglers" - Oghren, Dragon Age
I think she was stronger, at least compared to the children- Wookiepedia says she made the Son and Daughter bow to her after beating them into submission.
The Son gained his power from the Font of Power, and the Daughter from the Pool of Wisdom, but Abeloth sampled from both.
While the others couldn't duplicate their feats, I think the big orders at their strong points would still win in a fight, considering Abeloth was defeated.
__________________ "You must begin by gaining power over yourself; then another; then a group, an order, a world, a species, a group of species... finally, the galaxy itself."
- Darth Plagueis
"She may be small but she packs a punch and when shes in this mood...she goes for my danglers" - Oghren, Dragon Age
I will make short summary.
The Ones appeared out of god knows where.
Son drank from Font of Power and as result he became Darkside avatar. Daughter bathed in Pool of Knowledge and as result became Lightside avatar.
Abeloth at first was just a mortal woman possibly Force-sensitive and acted as servant. As she got older she acted as mother. As she became even older she wanted immortality. So she both drank from Font of Power and bathed in Pull of Knowledge. As result she became so strong that handled both Son and Daughter but was driven away by Father. Later Son and Daughter defeated her in combined effort and trapped with Sinkhole Station.
Story suggests that she was more powerful than either of children. On the other hand Father and Son demonstrated absorbing and deflecting lightsaber, while Abeloth didn't. But that could be because of boost from Mortis. Another difference is that the ones could shape shift in anything they wanted, while Abeloth only in those she consumed. It could mean that the ones are more powerful or maybe Abeloth simply lacked those specific powers.