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)