Pretimes are better for 0sec torrent trackers. It's because of the way it works, on trackers you would have several guys with access to sites using a script so that as soon as the sitebot announces a newdir or sitepre line in the sitechan they grab it from the ftp server and then post it to the torrent tracker. Whoever has the fastest source and manages to get it to the tracker first will post the torrent. The admins/coders would have put a system in place to prevent dupe torrents, thus having only one torrent for each release and a very good pretime. This works the same for TV, Movies.. pretty much all sections.
With Usenet it's an entirely different system and afaik most stuff isn't autoposted. TV releases are autoposted by one bot/autofiller but last I checked it was getting them from torrent trackers so it would probably get it 20-30 seconds later.. only a slight delay, 20-30 seconds is not much. But then it needs to generate the parity (par2) files, depending on the size of the files this could add quite a bit of time. Luckily TV releases are fairly small so it doesn't take long to generate them. So as you can see the good torrent trackers win with pretimes. Remember though, pretimes aren't everything, releases would be on usenet for atleast 365 days now on good servers, outliving most torrents by far. Even if the torrent for the specific release you want is still active on the tracker, there is a chance that whoever is seeding has a slow connection. Usenet is good with other sections too such as movies, games etc. These may be autoposted by some people, i'm not sure on that though. I do check often and pretimes for these are pretty good, not as good as the top 0sec trackers but still good.
Forgive me if i've messed up this post somehow, hard to type when you are tired
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