Some very insightful responses to your question, let me add another view. I bought the iPad Pro 10.5 specially for using Scrivener while on the road. I find it to be the perfect companion for frequent air travel; the screen resolution, size, and functionality of Scrivener iOS are a wonderful combina...
It took me a bit of G2 (guess and Google) to get comfortable with Scrivener iOS sync on Dropbox, but the investment is well worth the time and trial. The ability to work of an iPad Pro is important for me and my frequent travels, once confident in the app, there was no looking back.