He may be white, but he's not as good as other white rappers. He switched his style during the years, and his style sucks nowadays.
If you're talking 'bout whiteboyrap, listen "Machine Gun Kelly (MGK)" "Yelawolf" "Mac Miller"
If you're digging Wiz Khalifa, try "Curren$y" and "AZ" AZ's the most underrated rapper, ever. That's not just my opinion, it's a fact spread all over the net.