Folks, Ashoka needs some respect. I've heard people argue that ventress could beat her, statements saying maul would stomp her. The problem assessing ashoka is the lack of material on her. Prime ashoka as of rebels has been in three fights. One of those fights is meaningless as all of the people we are comparing her to would also beat those two inquisitors easily. So really we have to draw mostly from her showing against vader. I do think however we can estimate where she is based on these.
Force powers: Prime ashoka hasn't used the force all that much. Considering that anyone ashoka is being compared to could ragdoll inqusitors, we really only have one force feat, pushing vader. This feat alone however is enough to say she is extremely powerful. Could kenobi or maul do it?(non canon comics are non canon) Doubtful, Vader is extremely powerful, he is canonically 80% as powerful as sidious. has casually flung tie fighters with ease, has force choked people through holograms, has used the force to survive being trapped under a collapsed palace for weeks, has flung enemy aircraft while actively enganged in dog fights, so force pushing him requires a lot of power. As vader and ashoka both landed force pushes on each other, is it possible the equal? Its possible but with only one feat from ashoka, its not something i can say with any degree of confidence. What we know is she is at lease as powerful as kenobi or maul, possibly as powerful as the likes of windu, and possibly, but but unlikely as powerful as vader. Lets take the middle,and put her at the level of mace and dooku. Due to more feats, for now she would be a bit below dooku or windu, though not necessarily outclassed and if we see more of her(which we should), her being placed higher is not out of the question.
Now vader is stated to be in his prime. So ashoka contending with vader is impressive. Lets take a look into why. In my opinion,Vader is essentially a more advanced dooku. Like dooku, vader became the definitive master in a form and found ways to combat every single other form and compensate for the weaknesses of that form. What sets them apart is that vader implemented all the lightsaber forms in a hybrid technique. I can't think of anyone at the top of my head who did this. Vader also was able to utilize his armor and superior strength while compensating for his speed disadvantage and his one weakness in his armor, his resperator. Vader could deal with multiple opponents and also could deal with single opponents extremely well. He has dueled up to 7 jedi and has beaten the likes of obi wan kenobi, the definitive master of soresu, and luke skywalker. In fact the tfa novelization states he only lost to luke in rotj because he was holding back. This category is where ashoka is edged out. While he was unable to land hits on her, and she landed two physical strikes on him, one of those was on a distracted vader, and the other had no effect on him. Vader was pushing her back throughout the fight. However, ashoka's ability to contend with vader puts her at an extremely high skill level. I see her dueling abilities as comparable to anakin and dooku. Both would lose duels with vader, but both would avoid being easily overpowered. Dueling wise i could see kenobi matching vader with skill, but his inferior physique would give vader the edge as it did vs ahsoka.
So what is my final assesment? well i think she is between a tier 8 and 9. She is outmatched by vader, but is not outclassed. She is above the likes of kenobi, but he'd give her a really good fight
Next up, kenobi, its time this bamf gets the respect he deserves.
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edit: I've updated it