qBittorrent's what I use, Deluge is good unless you're planning on seeding more than a few hundred torrents (like if you're in a private tracker), transmission's good.
Do not use uTorrent. All private trackers have it banned because it misreports and has bad development practices. Further, it has ads.
I'd recommend qBittorrent but there's a bunch out there, the approved clients list to my most active Private Tracker lists Deluge, KTorrent, rtorrent, PicoTorrent, qBittorrent, Synapse, Tixati, Transmission.
uTorrent has bundled a cryptominer with the software in the past, so they are untrustworthy. I'd recommend using qBitTorrent or checking the megathread for other options.
I've used deluge in the past, but transmission's web ui is mint. Super easy to manage everything if I can just login to the webui, as I actively dislike apps.