When comparing aria2 vs BitLord, the Slant community recommends aria2 for most people. In the question“What are the best Torrent clients?” aria2 is ranked 4th while BitLord is ranked 15th.
Ranked in these QuestionsQuestion Ranking
Pro Free and open source
Pro Supports multiple download protocols
Has support for lots of download protocols including BitTorrent, Metalink, HTTP, HTTPS and FTP.
Pro Small memory footprint
Due to aria2 being a CLI only tool it uses very little memory.
Pro Remote control over simple standartized RPC
XML or JSON-based RPCs can be used to control aria2 remotely with both APIs completely documented. Simplest client that uploads torrent to be downloaded is 3 Python lines long (no 3rd-party libraries, only stdlib).
aria2c --help=#rpc to see more.
Pro Third parties offer a clean web interface
Some web interfaces consist of pure HTML+JS, no server-side needed (except aria2c of course). It uses the same RPC that can work even over WebSockets.
Pro Direct streaming
You don't have to wait till the complete video is downloaded, but can start streaming and watching directly.
Pro Easy and friendly interface
It has an easy and friendly interface, so it is easy to learn how to use it.
Pro Search torrents inside the application
It has an embedded browser to search for torrents and download or stream directly from it.
Con No native graphical user interface
While there is a web-based GUI, there is no native interface.
Con Does not have many available options
It does not have many options for configurations on Torrent downloads, although it has the most used ones