OK.
qbittorrent is very good. I like it.
Honestly, I'm suffering from what utorrent is offering now, ads... sometime force recheck... but I must use it because it supports cross-seeding much better than any other torrent clients.
Hope that qbittorrent will support more on cross-seeding, for example the case 2 torrents have the same content but not the same folder name. It's an annoyance when you love two sites and you have the content but you can't seed that content on another site just because those two torrents don't have the same folder name and qbittorrent does not support such that cross-seeding. Isn't that a waste of resources?

Edit:
- I don't have the habit of using different torrent clients on a location.
- I've not tried qbittorrent plugins that support cross-seeding, and even not known whether there is such a plugin or not.

Any suggestion?