What is more popular between V-pop and C-pop ?

C-Pop has a lot known survival shows and C-drama who's OST-songs sometimes get recognitions outside of the country. C-Pop has also a lot very famous artists as like G.E.M, Jay Chu, Jolin Tsai and many more. It is also known trought former KPop-idols as like Lu Han. People also do know the Chinese AKB48 groups.

V-Pop's only popularity outside of the country is Song Tung-MTP most of the time when you ask someone if they ever heard of a Vietnamese song before.

china is the most (or second most) populous country in the world so... probably C-pop