Assuming you're referring to seedboxes only, Debian. My load average is around 0.26, and that's with all sorts of things running at once (rtorrent/rutorrent, apache, ZNC, eggdrop, mysql, xvfb, etc). Having a load average of 2 running rtorrent alone implies CentOS is a terrible choice. And that's with 200 torrents, not 60.
Other advantages: easy package management, abundance of guides, very stable operating system (unless you're running SID), and low resource use.
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