Omg that's a really hard decision actually... I love their both voice... and they are special on their own ways...
But if I have to choose then I think Zelo will win cuz I've liked him for a longer time than Himchan. 
 
Kpop, bap, himchan, zelo,
After watching B.A.P camp I really like all the guys in B.A.P they are so funny and calm. They don't play too much. And I have to be honest and tell you before I watched the camp I hated Himchan the most in the group, but I don't anymore
 
Kpop, bap, himchan,