Meanwhile, the UBW OST
(particularly a lot of unreleased tracks) had a lot of real gems in it, including giving Shirou and Archer distinctive, separate themes, and giving Rin, Taiga, Berserker, Caster, Shinji, even the freaking
track team Luvia who appears for less than three minutes their own leitmotifs, all of which I found fit the characters really well.
Find a quick look over here on YouTube, but I don't think I want to post an ffshrine forum link where you can get all the tracks separately in a public setting since the site's basically all illegal downloads.
As for things in the released tracks, I really like most of them, but my personal favorite original piece is probably Storm.
The Madder Red Town cover in the Sunny Day ending is also a lot less annoying than the one in the game (not the one in the credits, I'm pretty sure that was directly transplanted from the original VN, I mean the one in the last scene itself).
In my opinion, Fukasawa's Excalibur is actually a lot better than Kaijura's. It's tone is medieval, it's exciting, and it doesn't add unnecessary vocals that nearly overshadow the original track. I would be fine if Kaijura did this for the Black Excalibur because the vocals really took away from the track overall. Not enough attention was payed to the instruments, there were just a few woodwinds and strings, and Kalafina's dissonant chanting. It sounded like any other fight track on the F/Z OST. Meanwhile, in Unlimited Blade Works, we've waited for this moment for twenty-three episodes iirc, and even though it's a very short rendition it is perfect for the scene, and still sounds beautiful on its own. The opening has the best rendition of that section of Sword of Promised Victory, and really does exemplify how grateful she is to have met Shirou and Rin. I've always thought that Sword of Promised Victory sounded too much like the theme of a rampaging tyrant, and that's not what Saber is anymore, which makes it kind of disappointing that it's the only theme she really gets in the entire series, just because it's become so iconic. But keeping it short actually mitigated that a lot. It was exciting, but kept brief enough to be less of a rampage, and more of a bright spark.
I actually liked Vortex of Fate too, despite knowing that it sort of was used to shunt out Church on the Hill in a sense as Kotomine's theme, but at the same time, Spiral of Fate was used very often when Kotomine was on-screen in the VN anyway, and Vortex added the eerie Fuyuki Fire mix of Shirou's new leitmotif to it as well.