i feel like this thread misses the forest for the trees.
your #1 risk in torrenting isnt malware thru clients, its copyright BS from content owners and ISPs. client selection is wayyy down the list and is essentially a non-issue if you are using private trackers (as you should)
im moving away from windows (as its garbage and keeps getting worse) but for windows the latest qbittorrent is as good as anything else, security-wise
utorrent 2.2.1 was the standard for many years and was operationally superior to qbit (and if you ever dropped an external usb disk and had qbit thrash your disk while attempting to hash check hundreds or thousands of torrents simultaneously you know what im talking about). now it is long in the tooth and scheduled for deprication by the major torrent sites
hands down the best alternative for operation, security, and stability is rtorrent with an rutorrent frontend. my homelab (nothing special - a $200 desktop with a fat ass 3.5" drive in it) runs rtorrent on a basic linux install and has been seeding well over 10000 torrents without a hiccup or a crash for well over a year.
if youre really paranoid about copyright, etc, (im not as i dont use public trackers and rarely DL movies and TV shows) just rent an application slot in the netherlands for less than $10 a month. its way faster than your home internet and you can securely transfer files to home via FTP, resilio, rsync, and numerous other methods. having rutorrent/rtorrent on both ends makes migration a breeze as you can easily move as many torrents as you like to a single folder, then highlight and right-click the list of torrents and download every .torrent file in a zip to checksum/resume seeding at home.
you could also torrent movies to there and watch them at home over plex or emby. you can also move back and forth between gdrive and mega to your slot to torrent or mirror filesets. well worth the cost imo.
at the end of the day, i dont think theres a single fileset i cant find on the private trackers like red, ops, ipt, concertos, anonymouse, LL. Etree kinda sucks these days and LL is a better alternative imo. i cant recall any user having a single security issue with any of the lsit of sites above, i certainly havent. whether you are downloading cracked software and running keygen .exes on your computer, i cant help that, nor would downloading that file witha different torrent client or platform make any difference whatsoever.
happy torrenting