Ranked in these QuestionsQuestion Ranking
Pro CLI interface
Pro Reasonable feature set
rTorrent covers basics such as Prioritization, Selective Downloading, DHT, PEX and Magnet URIs. It includes MSE/PE for security. It has graphical and command line interfaces. Has UDP tracker and µTP data transfer protocol support. Even covers Super-seeding.
Pro RUTorrent is a great web interface for RTorrent
Pro Supports thousands of torrents easily
Pro No extraneous functions
Torrent is a CLEAN client. Meaning there’s no search engine, tools, or other things to bloat the program.
Con Requires manual router configuration
The client lacks support UPnP, NAT-PMP or NAT traversal for automatic router configuration.
Con Files can't be downloaded sequentially
Con No IPv6 support
Con No proxy server support
Con Lacks µTP transfer protocol support
Con No tracker exchange
Tracker exchange functionality allows peers to exchange information about trackers of a given file. It is another way of ensuring that the file is downloaded from the optimal source. rTorrent lacks this functionality.
Con No search
Built-in search engines allow finding torrents to download right from withing the torrent client. rTorrent lacks such functionality.
Con No embedded tracker
An embedded tracker allows turning the client into a server offering an easy way of sharing files with others. rTorrent lacks embedded tracker support so another method of sharing or different client has to be used to share files.
Con No web seeding
Web seeding support allows downloading file parts from an HTTP source alongside the swarm. It's usually used for long-term seeding and easing some of the load on web hosts that supply direct downloads by offering a BitTorrent download as an alternative while still ensuring that the file is always available in its entirety regardless of the swarm. rTorrent lacks this functionality.