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UBW is my favourite too, but I do wish it had more of Illya. Rin and Archer being super prominent makes it a good route, because they’re so fun to watch. Plus you get Shirou at his snarkiest, which is great. I also prefer the ending,
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I like how Shirou decides that the process of saving people is more important than the end goal, and I think that makes it more interesting than either going all in like in Fate, or abandoning it. Plus he actually starts working on his terrible mental health, which is nice.