Arctic Torrent is the best client ever, of course
uTorrent gets worse with each version. Many people stick to old ones, and which of them is the best is a matter of taste, but you can go all the way down to 1.6.1. I use one of the newer builds, but it's a custom version I spent an hour decrapifying (Facebook integration!? Just why!?).
qBitTorrent preserves the same "feel" while providing a cleaner alternative, and I wish Halite's development was active (not that the latest 2015 version is unusable).
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