I just use aria2c these days, for CLI it works more intuitively for me, but rtorrent is great as well. aria2c feels more like running curl or wget, much more intuitive for scripting with it. I'm just glad there are many choices.
As far as WebUI goes I do prefer qbittorrent.
For people really serious about torrents on the CLI/TUI, this is the best one I've seen: rTorrent-ps: https://github.com/pyroscope/rtorrent-ps