Hello, I am new here as it been just 2 days since I join this wiki. And I would like to start my first debate in one of my favourite franchise, Toaru Majutsu No Index or TAMNI for short.
Attack Potency
-I would assume their Attack Potency is similar enough to not warrant a defeat in just a single strike for both of them, though Saber highest AP is due to her Noble Phantasm while for Knight Leader or KL is him defeating Kanzaki Kaori, which would be disadvantage for the former since its usage can exhaust her.
Durability
-It seems that KL is superior due the clash with Kanzaki Kaori and even caught one of her attacks while Saber remains a tier lower
Speed
-Since speed is equalize so neither had an advantage. Although one of KL pattern magic could bypass that.
Combat and Experience
-It is said that both of them are good in the usage of swords and been shown to do so. Although I have yet to find anything to say that either is great enough that it could effect this battle. So it is not the main factor for me. Though I would say that Saber is most likely better.
Abilities
-KL abililities gives him great advantage, his Slicing Power and Weapon Weight might give Saber trouble especially the former if it could cut her sword, though I am not sure if it can, the latter though can push Saber back by recoil. Attack Range will not allow Saber to gain distance while Precise Accuracy allow to strike towards her weak point. The Movement Speed his biggest advantage as it would increase his speed greatly that Saber would have hard time tracking with her eyes or follow, especially in a speed equal scenario.
Now I don't think that Enduring Solidity is useful as his sword would be durable enough to clash with Sabers. Though Special Use is an odd one, I am unclear whether Saber's dragon blood would take effect.
From the conversation, it seems that there is a debate to whether Saber can be affected by the Thororm Spell, though I would provide a defense for Saber as to whether he would be able to even if the spell is viable, as her sword is invinsible thus cannot be seen. So KL might not be able to affect something he cannot see.
-For Saber now, not much of her abilities seem that useful in this scenario, her precognition could help her predict KL attack even with Movement Speed. Her Magic Resistance doesn't seem useful as most KL magic is self amplified. Attack Range, Slicing Power and Special Use might be affected to a degree
Conclusion
-From the analysis that I did, I would conclude that Knight Leader has a better chance as he has superior AP and Durability. He also abilities that would make use of his stats as Precise Accuracy, Attack Range and Movement Speed will not allow Saber to gain distance nor use her Noble Phantasm, the attack that could harm KL the most with the last magic I believe would be the most effective.
Though it is unclear whether Thororm could affect Saber, her Invinsible Sword may or may not counter that regardless as KL might not be able to affect what he can see(you can debate whether he can). Although Hrunting has no such limitation and thus can be use regardless.
So my Vote would be Knight Leader. I would like to hear insight of my analysis and whether there is extra information that could change my conclusion or if my deduction is misinform.
