Though most private BitTorrent trackers would like to pretend they are secret and elite, search engine Corrupt-Net makes it very easy to find out which ones are the quickest to get new torrent releases.
Corrupt-Net's Pre search is a simple search engine that will search multiple BitTorrent trackers for a torrent, and show you in which order each tracker got hold of a given torrent. When you first search for a torrent, you'll likely get a long list of search results, some of which will have a green "Raced" link next to them (see above for an example). Clicking on it will give you a small table, showing you how long it took a given BitTorrent site to add that torrent to their index:
A quick Google search will reveal the name of the torrent site corresponding to a given acronym (e.g. "TL" in the above image obviously stands for TorrentLeech), and repeated searches on Corrupt-Net should reveal which trackers are the quickest to release the types of torrents you tend to download. Hit the link to check out the engine. I'd also highly recommend reading the linked TorrentFreak article, which provides some interesting details on the site, how it works, and the culture behind the race for BitTorrent trackers to post new releases.