12 Bar Blues by a large margin.
Happy is a huge disappointment for me. I've given it 4 or 5 listens, but I can't get into it. Everyone here talks about how varied it is, but I find that 75% of it blends together into one nondescript, whiny song. The instruments change, but the beat stays roughly the same, and the lyrics are equally forgettable. The other 25% is good, but nothing to write home about. I could do without the second CD entirely, if not for Hyper-Fuzz-Funny-Car, which fits into that "good, but nothing to write home about" category.
The mix on both CDs is kind of odd, in that the vocals are too low and some of the synthesizer sounds are way too loud. For a great example, listen to Arch Angel. The 1980's $50 Casio keyboard sound that runs through the whole song is annoyingly loud compared to everything else.
The artwork is pretty nice, so at least it'll look good sitting on my shelf. Obviously, I'm "happy" with my purchase.