Yo are you talking about Nas' album or Kendrick's
untitled unmastered?
To Pimp is definitely better than Nas' album to me, it's just much better produced and executed conceptually the music is just flat out better even though I'd argue Nas was sharper lyrically on his album. If you go with Nas album being better you have to have a bad ear for music that's just the way I see it. There's songs on that album I love like Queens Get The Money, Y'all My Nikkas, Breathe but as a whole, it's a 3.5 mic album.
If you talking about Kendrick's new shyt I disagree, dudes gassing the shyt out of that I could see why them songs didn't make the album. I just felt it's a cool little project of shyt that could have made the album, a bit of it is all over the place. Untitled 08 is piff though...
I agree Untitled is better. Personally I think all of Nas' albums are better....

even
Nastradamus?