Okay, I finished Trianthology.
As far as a spoiler-free review goes:
I enjoyed it. I liked Country Girl the best, followed by High School Love Adventure, then Vespio 2438. Vespio 2438 wasn’t bad, but as I expected, it was full of technical terminology, making it kind of hard for me to read. Also, the genre isn’t really my cup of tea.
Anyway, that said, I have to admit to being a bit disappointed in Trianthology. I guess I was hoping for something more ‘epic.’ Also, it’s very preachy. Now, pretty much all of Ryukishi’s works are kind of preachy, which is fine. But if you go too far with that, it starts to feel less like a story and more like a sermon.
So I would say I liked Iwaihime better overall.