A very useful feature in µtorrent is the possibility to see not just only the total amount of Peers for each tracker in the bottom Trackers window, but also to be able to see the total amount of seeds for each different tracker. Say that you are downloading a file from 3 different trackers simultaneously, but only one or two of the trackers have any seeds and you therefor want to remove the tracker(s) that doesn't offer any seeds. Or if you added a torrent that uses a tracker or several trackers, but you discover that there are plenty of seeds using DHT or PeX and you therefor don't want to depend on any trackers and want to remove them. In qBittorrent in the bottom Trackers window it only shows the total amount of Peers for each tracker, and therefor you don't know if the tracker listed contains any Seeds or just Peers.
libtorrent does not provide this information yet.