µTorrent vs. Transmission-Qt Portable vs. qBittorrent

I've switched from uTorrent to qBittorrent a few months back and haven't looked back since! In most regards I find qBittorrent to be better than uTorent and as a bonus qBittorrent is Open Source which has many advantages over closed source privately owned programs. As for Transmission-Qt - it seems a bit too lightweight for me. If you don't need many options I believe there was a JavaScript based addon for Firefox that could download torrents.