Johnny and Kenshi, no contest. Jin and Hwoarang are friends, but on Hwoarang’s side, it’s more of love-hate relationship. He hates him from the heart. As for Kenshi and Johnny, they’re best friends who at first were cold to each other, but then became best friends. Johnny I think is more fast and skilled in combat, while Kenshi has Sento which grants him telekinesis and psychokinesis.
Johnny Cage and Kenshi
Jin Kazama and Hwoarang 
