For torrents I recommend rtorrent and rutorrent for client and webui. Rtorrent is fast and handles scale well, and rutorrent has a nice interface and features you would expect in a desktop UI. Unfortunately there's no docker container that has VPN, rtorrent, and rutorrent set up for ARM architecture, so either you have to do a setup with qemu, or you have to set up a separate VPN container, nginx container (to access the webui), and finally a rutorrent container. If are satisfied with a simpler UI then I recommend this Docker container as another user suggested.
For torrents I recommend rtorrent and rutorrent for client and webui. Rtorrent is fast and handles scale well, and rutorrent has a nice interface and features you would expect in a desktop UI. Unfortunately there's no docker container that has VPN, rtorrent, and rutorrent set up for ARM architecture, so either you have to do a setup with qemu, or you have to set up a separate VPN container, nginx container (to access the webui), and finally a rutorrent container. If are satisfied with a simpler UI then I recommend this Docker container as another user suggested.