There are three types of private trackers: general, specialty, and niche. A general tracker has most of the newest of everything - tv and movies and music and games, etc. A specialty tracker focuses on a specific media - movies or comics or audiobooks or TV, etc. And a niche tracker focuses on a specific interest - British television, or horror movies, or dnb music.

A general tracker has very similar content to public trackers, though they tend to be more secure. And like public trackers, while they'll have the latest items, and old popular items, they tend to have retention issues.

Since a specialty tracker has a narrower focus, it tends to have deeper archives for it's content. A movie tracker, for example, instead of having just the most recent movies and a back-catalog of older blockbusters, will have those plus a catalog of older, more obscure, less popular content, and it will often offer that content in multiple formats and sizes.

And a specialty tracker goes even deeper for those that have a particular passion for the subject that's covered.

Do you need a private tracker? IMO, most people don't. Most people are happy with what they have, or are happy with what they get from public trackers and other places. It's really only if you're finding yourself unhappy with public trackers - you're not comfortable with the lack of privacy, for example, or you're often looking content that you can't find - that I would suggest looking into private trackers.

Makes a difference when you want to get something that's a bit more older or more obscure, you'll notice few to 0 seeds on these public torrents. If you find these titles on a private tracker, you will find it well seeded with high speed peers as most people use seedboxes for seeding the torrents.

First is speed. I've been able to get speeds of ~50MBps (not Mbits) on private trackers, granted this is dependent on Internet connection more than anything but I get 20-50% of that speed on public trackers.

Second is retention and breadth of selection. If you're trying to download the latest Marvel movie then every tracker is gonna have that, but if you're looking for an older movie then it's much harder to find on a public tracker. And if you do find one, it's likely to be seeded by 1 person and you can only squeeze 10KBps out of it.

It's more of a broader benefit for everyone, but there are seems to usually be (a) rule(s) stating you have to seed a minimum amount of torrents to a specific ratio, which I don't fully understand how that works past it helping torrents from completely dying.

Other than that, I don't have a clue since I have never been apart of one.