oh god, the composition is far better than Stella for me. Although I have to say, you can't compare them. at least for me. but I really like the melancholic atmosphere and the concept of both songs in general. Stella feels more dreamy, this one feels more unsettling and stressful. Which is good, considering the story they're based on.
It took me a while to get it, but now I can finally say that I enjoy it entirely. Maybe that's why it's not as popular as Stella - the later is just "easier to appreciate", I'd say.
I still like Stella better, but Write Once, Run Melos! is really underrated, for sure.