Lupe gave people hope, he was seen as the "savior" of hip-hop.
on his first two albums he was rapping with such genuine emotion. Hurt Me Soul's opening lines get me every time: "now i ain't trying to be the greatest, i used to hate hip-hop, yup, because the women degraded..".
Kendrick is obviously bigger though. it's hard for me to say better because i consider Lupe's best moments to be on par with Kendrick. but Kendrick is definitely more consistent. at least he has been until today. i just hope he'll never fall off.