In all honesty, young thug has catchy songs that are aimed to the simpletons that grow up in environments where education isn't high on the priority list. His lyrics are mediocre, production just average fruity loop beats, overall boring.
K-rino has an extensive biography with not that many catchy songs, but heavy writing content on various subject matter. His production too is average, just a different type of average that doesnt have that redundant "bounce" tempo.
If I had to choose one of the two to listen to for the rest of my life, k-rino is the choice easily. You can only go so far with talking about dope, money, material shyt, etc. with the same drum sounds until you really feel like throwing the shyt in the trash.