The official Mastodon app sucks for iOS as well, yet I have it on my phone and beta test it. My go to app is Metatext as it’s the most simple to switch between timelines, see hashtages, etc. I’ve also had tooot for a while which is pretty good and I like Mastoot which just went into testflight beta testing. Mammoth is a new one that I’m also testing with Testflight and has some unique features like being able to see local timelines of other instances. Each app has its own unique functionality and interface and I feel like the abundance of them forces each to try harder and be better so it’s definitely not a bad thing to have a unique view of your corner of the Fediverse.