I’m pretty happy with qbitTorrent. Open source, so they won’t play games like uTorrent did (I jumped when they first started to ‘monetize’). UI is a lot like uTorrent, only the WebUI works with all browsers.

With Bittorrent clients, there's a freeware one you dead forgot; I found it when I got SERIOUSLY disgusted with how uTorrent was going. Meet qBitTorrent: http://www.qbittorrent.org/. Solid, does the job, open source and freeware. Not to mention pretty lightweight. ^^