I use Transmission with KDE.
https://flathub.org/es/apps/de.haeckerfelix.Fragments
My favorite torrent client when using Gnome, for KDE looks best qbittorrent
Discussion
Last time I try that sucks their implementation of Qt. That's why I preferred more qbittorrent after the devs dropped support Ktorrent. Another reason why I like more the Ui/UX of Gnome, I believe if a good Ui is implemented it will attract the interest of new people around Linux.
🤷 I got used to Transmission on macOS. It seems fine, although I don’t use it often. When I do, it’s usually to download an operating system image.
I balked at GNOME because it seemed like the developers were too eager to sacrifice usability to conceptual purity. Everyone who uses GNOME has to install extensions on top of it.