I mean, we have some writers letting a non god of stories loki turn wanda into a cat, we also some like the writer of strange tale had Hela stomp Wanda with ease, Orlando himself straight up refused to answer if Wanda could defend against loki story manipulation.
I feel like you're leaving out too much context and misframing instances by citing what happened in the comics without any explanation. Wanda wasn't transformed by Loki into a cat, not in a way relating to power levels. It was a filler, comedic issue showing Wanda brewing a magic potion, and Loki sneezing his magic into it, causing the potion to be improperly brewed and turning her into a cat. That's all that happened.
At the end of the same issue, Wanda and Thor trap Loki in a cage after he gets caught throwing the potion at other Marvel heroes. Are we using that as evidence that Wanda and Thor are above God of Stories Loki too? I hope not.
Hela did in fact beat Wanda, but within the same story, Karnilla beat Strange, Amora messed with Hulk's mind, and Hela casually swatted Hulk. It also happened before Wanda fought Griever, and when she sealed away Chthon in her soul, making her weakened. The timing of the comic, and when it takes place shouldn't be used to invalidate a much more "stronger" version of the character, when we also know she was specifically nerfed by an Elder God. Also, Wanda had the best performance from anyone on the team against Hela, including from Strange, and Hulk, so take that as you will.
Wanda doesn't have the best feat without chain scaling, Wanda to what? griever? is the best we can go who isn't all that as abstracts go due to her weakness to mundane stuff; and wanda still needed a lot of help against her or maybe elder gods? cos she beat oshtur outside her realm and could technically beat Chthon via some shenanigans but Loki outright was shown to be comparable to Nyx without using story magic, his runes alone has been very potent , removing the All - power, that thor had to use a special belt to defend against Loki's rune craft. Plus he's the only character to have been closest to true freedom aside from beyonder, and I'm not talking about some possibility never queen bs cos they're all still bound by House of ideas, meanwhile loki could have removed himself from House of ideas influence but chose to go back into eternity to free everyone else. I mean what beyonder did in defenders beyond is something loki could have done too . Wanda has never gotten close to that level of scaling.
What help did Wanda need with the Elder Gods? Off the comics, she not only banished The Vishanti in the astral realm, a realm made by Oshtur, but she literally just one-shot the same Oshtur with a Galaxy
(Using only her finger-tips to blow it off even more). She then beat Shuma Gorath, a Great Old One explicitly stated to be the strongest of his kind, just in her last mini. More recently, she literally trapped Chthon in a universe of her own making.
Loki is also nowhere near Elder Gods. Utgard-Loki, and the other Utgard Gods are shown to be vastly more powerful then he is in Immortal Thor. Gaea made the prophecy stating only Thor could save Midgard and all of existence from the Elder Gods, which is why Loki needed to test Thor under different trials so he could become powerful enough to face them at the end. Loki actually needed the power of Eternity, a piece of him, just to defeat Kemur himself. Wanda on the other hand is stated to not only be above Elder Gods, but is able to directly defeat and and overpower the same species of Elder Gods with her own power. Her performance against Elder Gods actually reinforces Loki is weaker than her, since Loki's routinely struggled with them.
Furthermore, Loki doesn't have "freedom", and him being close to achieving it is irrelevant, because in the end, he choose not to transcend the multiverse, making it redundant to the discussion, as he never obtained any form of "freedom". He confined himself back into the box of reality, as he himself said in the very own comic by reentering the multiverse. Conversely, Wanda is possibility, she embodies freedom in nature, and in existence, she doesn't need to "obtain" it. She was born with freedom. It's why she outclasses him on paper, at least cosmologically/metaphysically.
I see loki as her superior in all ways and has more knowledge and skill with magic that she can't hope to comprehend.
We also don't know where she would scale after the whole sorcerer supreme stuff cos prior to that she admitted inferiority to sorcerer supreme magic in One world under Doom.
I agree Loki has more skill, since Wanda's chaos magic isn't something compatible with finesse. Knowledge? Not really. Wanda now possesses all of the knowledge of The Darkhold, and The Darkhold is one of the greatest tomes of knowledge for magic in Marvel.
In One World Under Doom, Sorcerer Supreme magic was also amplified and boosted astronomically by the life force of millions of citizens in Latveria. In the same issue, it was later revealed that Doom wasn't only using Sorcerer Supreme magic, but also other forms of magic with preparation, such as blood magic, time magic, and chaos magic. The feat isn't applicable to standard Sorcerer Supreme magic.
Additionally, Doom said in the One World Under Doom Avengers tie-in that Wanda was holding back her power immensely. If Wanda can defeat the Vishanti, the same entities empowering the role of Sorcerer Supreme, then Sorcerer Supreme magic alone is clearly not above her.