roll20 API to a Mu* interface, side-by-side == I'll be in my bunk.
Storium harkens more to where we came from, when we were essentially turning the "Choose Your Own Adventure" books into a multi-billion dollar computer game genre. They're going back to the books, taking cues from the Fallen London engine, and mixing up something new.
I don't know where this pissing match disagreement of ideas came from, but I found invoking both "roll20" and the "Storium" to be along a path more right than Evennia. I will let the server nerds argue server shortcomings.