When comparing aria2 vs WebTorrent Desktop, the Slant community recommends aria2 for most people. In the question“What are the best Torrent clients?” aria2 is ranked 4th while WebTorrent Desktop is ranked 7th.
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 Streaming supported
Before the torrent is complete, you can stream the video and audio. It even supports seeking - it prioritizes the current location instead of always going in sequential order.
You can also stream to Chromecast, DLNA, and AirPlay.
Pro Open Source
The developers have their files stored on GitHub.
Pro Beautiful interface
Pro Support webrtc peers
It supports webrtc peers which increases the swarm to allow for websites to stream.
Con No native graphical user interface
While there is a web-based GUI, there is no native interface.