My two favorites at least right now have to be:
Cold World - Sajjad ft. Sticcy-Z
Cold world is pretty damn close to perfection. No idea where they got the beat for this but it's amazing. I love the sample used in the background. The chorus on this has to be one of the best ever on TR, it's just so fucking catchy and laid back. There's also something to be said for the contrast between Sticcy's aggressive delivery and Sajjad's laid back delivery.
and
The Hangover - Big Ax-D
This has always been one of my favorite Ax songs. The beat it great and the content is really personal so it's a song that makes you think. The hook makes the song for me though, I know a lot of people didn't like it but it just does it for me haha.
What's yours?