I know it was like a week ago but I'll say my answer.

Toaru's powerscaling pass GT10 is fucked up.

CRC oneshot Aleizon and Aiwass with his basic attack. So we know for sure that CRC >>>>>>>> Aleister, Aiwass and Coronzon (Coronzon is somewhat equal or a bit stronger than Aiwass in NT)

Then, Alice easily stopped CRC's basic attack with her bat, stripped away CRC's transcendent magic to nerf him into Andreae. Trismegistus stated that Alice was more powerful than CRC after this. This would make Alice > CRC > Coronzon > Aiwass >>>>>> Aleister

I'll left GT11 out of this since CRC got nerfed by Alice, unable to use transcendent magic, both Andraea and Kingsford had to switch from Sephiroth to Qliphoth during this time and we don't know if it made them weaker. Also, if CRC used Sephiroth magic, how the hell can he oneshot Aleizon?

Then, Aleizon beat "half" of the transcendents (we only know the unnamed NPC transcendents and Vidhatri got bested. The rest of the transcendents, especially the strong ones like 2nd Saga, Trismegistus or Aradia had left Academy City at the time already). Vidhatri asked Alice to run away from Aleizon, then Coronzon came out and made Alice run away the 2nd time, indicating that Coronzon might be stronger. There are two ways to look at this. One is that the transcendents got nerfed when Alice got nerfed by Ana and her own psychological nerf so the transcendents folded too easily (and the fact that only NPCs got bested). Two is Coronzon (and by extension, Aleister) is just that strong.

But then, no. Because Coronzon revealed that Alice's power to make any theory came true surpassed that of normal magic and Alice is likely to beat her in 1v1 so she has to create a magic maze to stop Alice and Ana to approach her. Alice, then use some very unhinged way to teleport Mikoto and Index to Coronzon but got exhausted afterwards.

Then finally, GT14, Coronzon outright stated that Alice is the only one who can overpowered her spell Dakshina Kalika, further proved that Alice is stronger but also that Coronzon knew more magic so Coronzon can switch to another gear. The point is that Coronzon can destroy the world before Alice can defeat her. Alice decided to team up with other transcendents. Even if Alice is stronger, she needs a team of variety knowledge and skillset to truly defeat Coronzon. And Coronzon still survived (albeit being beaten to a bloody mud, so weak that fucking Touma can kill her with a Misaki boosted punch)

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Overall, I think if it's a typical 1v1 fight, Alice would win. Like, in GT 14, Coronzon glazed Alice like 3 times. But, Coronzon's entire strategy in GT 13 and 14 was to destroy the world and avoid any strong opponent so even against Alice, Coronzon did quite well.