I tried most of the HD trackers, these are my favorite for movies and TV:

- IPT (You can find almost everything)
- PrivateHD (Greate for Remux and 1080p contents, good seed)
- HD-Club (For Full BD)
- HD-Torrents

I usually use IPT and PrivateHD because they have more free leech torrents.

Another vote for BeyondHD an underrated and ratioless tracker

It is not ALTERNATIVE .IT IS BETTER THAN HDBITS - HDCLUB

HDB is one tracker that is very very special, like the standard for HD in the torrent world, but the standard is not always the best though HDB has a large torrent base and good quality encodes.
If you look for the content then you should try other trackers like IPT, PTP,....and Asian trackers. (at least, you can get in those trackers).
If you look for quality encodes, you should try uhdbits, IDE and some other trackers which has famous encode teams/groups.