For me it's the force of habit. I'm already used to the UI, I know where everything is, what to expect, I can navigate it very quickly and set it exactly how I want.

All the features I'm used to like comment drafts or the comment navigation bar (jump between top-level comments easily) are right where I'm used to. Doing the Android "back" gesture from the left works like it should, I don't have to confirm exit with a button, all these small things.

It's also very polished, for example I encountered two issues with Connect:

• it didn't handle internet dropping out (e.g. temporary loss of mobile signal) well - it just kept failing on the retry button even after connectivity was restored, had to restart it

• the search in the sidebar didn't show all the matching communities, this seems to have improved recently