Very similar thoughts here, Emrys' route was fantastic but Iris' was surprisingly just as amazing. The little things that start to make sense when you put all three storylines together are just *chef's kiss*. And I liked playing them in the recommended order (Em, then Darryl, then Iris).
Response that includes SPOILERS below
I KNOOOOOWWWWW. I was playing Darryl's route and every so often Em would pop in with a subtle reference, my heart! Imagining that MC would just go on never knowing about hi, I can't handle it. *Sobs* In my initial Em playthrough, I couldn't help but wonder if they would try to combine both of them back together somehow. What a great story, ugh, this whole thing is so beautifully-done.