What torrent client do you use and why?

I have been using many different torrent clients and have been changing thru them for different reasons, now i would love to know what you use and why to maka a wise desicion my self ^^

i started of with utorrent, switched to Vuze, Lokked at Transmission and made the jump, looking back at Vuze, and so on. My stop got to BiglyBT

It's basically Vuze, but without the ads and Opensource, also includes Transissions Web UI to my liking, also made a theme for it as a contribution that i have shared with the developers to see if they like it as much as i do. ^^

What do you use and why?