My goat mauls her

Who would win!

Swords!

Someone who can punch through magic resistance with ease via raw mystery and force full servants onto the defensive without any niche required!

I think people forget that Ayaka is a monster of a magus in her own respect.

Now, I'm only considering Standard Routes Shirou, because El Melloi Shirou clears pretty easily, but isn't the image used

If not for that assumptive process, I would be considering "Ayaka" which is the mystic code thrown together that rivals an entire holy grail

Ayaka from the Prototype universe at the time of the Second War, Shirou at the time of the Fifth War, any route.

Yeah Ayaka slams to an unholy degree. Shirou is goated but he's not "I have mystery so old I punch through a servant's magic resistance and mystery advantage with low level attacks" strong