Unchained was born long before stremio, because the real debrid app for Android sucked so much it got pulled from the play store. It's not as media focused as stremio, so if you're only interested in finding and steaming movies/shows it's definitely less useful. It does have some nice features such as searching links on torrent websites, support for kodi servers and it's also being developed a support for torznab servers (such as jackett). It's free and open source without ads, so you can just try it