Don't get me wrong, apollo is great. And I am going back to android for other OS reasons, I just like it more. I used it my whole "smartphone life" but wanted to try out ios since I saw a deal on an iphone and don't use my phone a ton anymore (I used to install custom rims and just sitch devices in general all the time). I decided to switch back to Android after a little under a year with iOS for smaller reasons like customisability, the Google ecosystem all my shit is in, etc... But to answer your question, some of the things I love about relay that no other app does is the built in browser that functions by just swiping down the bar, I used it a lot to go back and forth between an article some content and the actual reddit comments, I also really like the aesthetic of how it separates posts and comments, the swipe gestures are pretty standard, probably some other things I can't remember but it's probably just a personal feel.