>I only read fanfiction, but I honestly can't figure out ff. I read on ao3 simply because it's really easy to figure out, and I can search for what I want easily. Honestly, until this thread, I didn't even know there was a way to search by character.
You might find it more intuitive using their mobile app (or not, YMMV).
Google Play Store Apple App Store
For me the best feature is the TTS (which might just be an Android feature), but the interface is overall nicer to use as well. The filter icon when browsing stories is a little weird, but it's at the top and you only need to figure it out once.