BruceElephant I'm using Plasma and I would like to have the most unified system look as possible
I can understand Bruce's point, but I can also understand CorvisRuber's. I'm about as pro-KDE as a person can be, but I make application software decisions based on performance and features, not on who makes it. That's why all my Linux computers use KDE Plasma. It's simply the best, most configurable DE, in my opinion. And it's robust, lightweight, and fast.
But, I use Thunderbird for email, not KMail, and I use Vivaldi for browsing, not Konqueror. I much prefer gnome-mahjongg to KMahjongg, having tried both. And I prefer Terminology to Konsole, and I use it on every Plasma computer here. Those are just a few examples of non-KDE software I use based on chacteristics other than who makes them.
And the torrent client that I use to seed the Solus 4.4 editions 24/7 is Transmission, for no special reason other than I've used it for years, it's reliable, lightweight, available, and it's never failed me. There exist dozens of torrent clients available for Linux, and it's likely that each one of those has its own happy users, but I understand why Solus simply can't include and maintain them all.
Thus, my No answer to your poll. Not that I wouldn't like KTorrent -- I probably would. I simply can't understand including yet another torrent client without a good reason to do so.