On everything you have to listen to homie yourself and see what you like. Start at K.I.D.S and just move forward, dudes growth as an artist is remarkable. He started off in the pothead highschool student phase, then went hippy, had a moment when he has two personalities and then coasted into a rapper/jazz lane.
Only rapper I have ever seen show more growth would probably be Ross. Asking this question is going to get you three different answers in each post so I would just take the time to listen for myself and make my own decision. If you're not a fan of lyricists then don't even try