If you want a "set it and forget it" client for public trackers on a secondary device, grab Argo from F-Droid or GitHub. Avoid random "pro" APK sites – the real one is free and open source.
I’ve been testing torrent clients on Android for years, and I recently gave Argo Torrent another shot after a long break. argo torrent
Perfect for old phones or batch downloading. Get it on F-Droid or GitHub. Not on Play Store (by design). If you want a "set it and forget