I've used Apollo since 2016, when I wanted to add a picture to my comment, I had just to touch the image icon to do it. Using Reddit's official app I can't find the way to upload a image to my comment (not to a post). It's the same with nested comments, Apollo has a rainbow themed (customizable) nested comments, so it's easy to navigate throw comments, but official one is just a subtle line almost invisible that difficult the reading experience.
I like how different app are growing at same time than the communities, it's cool to be part of the process.