I have answered this about 3 times in here, dont mean to be rude but i have.

Since i only collect full quality here is my breakdown. I am not a member of hdbits.org yet but i do know people there, and have an idea of the content which is often posted on usenet, many hdbits.org members are also members of the usenet forum and vice versa.

1. Hdbits.org (for full blu-ray and quality, you will often find discussion of best quality releases. Thats why I love it, on usenet, similar discussions take place where hdbits.org members also post, and comparisons of different blu-ray releases. For instance pans labryinth the nordic blu-ray release has best video, and the uk version has best audio, you can also find directions on how to easily mux the two. For me this is invaluable if you want the absolute best quality blu-ray releases from around the world)

2. Chdbits (alot of new blu-rays posted well in advance, decent speeds and seeding)

3. Hdchina (same as chdbits, new blu-rays posted quickly, some even before chdbits, similar content at times, but they also have a bit different content as well, highly underrated tracker imo for full blu-ray)

4. tie

Hdroad (similar content as the above, stuff from hdchina and chdbits often reposted, not as good as the above, but bang for your dollar its excellent if your not a member of the above sites, huge selection of reposted blu-rays.I dont like the 4 gig download rule a month, its a pain, sometimes speeds are slow)

Hdtorrents ( very underrated, mostly reposted stuff, but also some users have exclusive content they upload, usually once a month i can find one new release there i cant find elsewhere, might be better in some aspects such as exclusive content to hdroad. I know some hdbits.org members who even use this site, one draw back is content is not seeded for a long time)

5. Tie

Hdspain/Hdcorea (alot of reposts from hdchina and chdbits as well, found next to no exclusive content, and less overall content then any of the above, both are very fast but both are highly overrated imo)

6. Hdstar (alot of reposts gathered from other trackers, old stuff not well seeded, but has a good selection for a tracker with open sign ups anyone can join)

I never cared much for others. Blu-bits, Bit-hdtv, hdme, ect...alot of these trackers are poorly seeded, and its users dont care for full blu-ray so theres not a huge selection and its poorly seeded.

Pretty much 90-95% of all blu-rays out there come from the top 3.

When/if i get into bits i might say goodbye to road, or maybe even before, they dont have enough exclusive content to warrant 4gigs every month or trying to keep track of it. Its a fantastic tracker if your not in china or chdbits.

Hd torrents has a quarterly download status quo as well, but its not monthly and has a bit more exclusive content then road.