Obviously my reason will be biased since I have used Azureus/Vuze probably 95% of the time I have been torrenting, but my biggest problems with uTorrent are as follows:
1. I am a member of quite a few places, and staff on various sites doesn't seem to discuss anything regarding what uTorrent versions to allow/ban. On all trackers I'm a member of, except for What.cd for obvious reasons, as long as I don't update Vuze right away there are no problems whatsoever. This not because the newer versions won't be allowed, but rather because they aren't added that quickly to allow list.
2. For the short while I used uTorrent I had many problems with downloading errors. These errors are virtually non-existent on any Vuze (or Azureus) version I have used.
3. With Vuze I can use queuing where it works (If I remember correctly What.cd wasn't one of those places. Gave timeout error) And force seed where needed e.g. to meet 72 hour rules etc.
4. I don't know if uTorrent has this now, but Renaming folders/torrents before downloading them, to make up for bad naming schemes like "(Year) Album" or "Album" or otherwise not following proper naming scheme. Something both What and Waffles are notorious for unfortunately.
BTW I would gladly help with testing.
Bookmarks