I spent the time to learn Marionette, and while it improved my Backbone code enormously, I found there was a pretty steep learning curve to using it correctly.

I spent the time to learn Marionette, and while it improved my Backbone code enormously, I found there was a pretty steep learning curve to using it correctly. And even so, I found doing certain things was often overly difficult or confusing. Recently, I switched a small project from Backbone/Marionette to React and I haven't looked back. The learning curve for React is tiny compared to Backbone/Marionette, and it is so much easier to 1. reason about and 2. recompose. Not to mention much better performance! It's clearly still maturing, but to me React feels like a big leap ahead of Backbone/Marionette.