Dragon Nest definitely. I do love some Dragonica, as I'm a bit mad at Dragon Nest right now (Too little updates for my speed) - But you can't deny the part where you play on an actual 3D plain and not sidescroll appearance makes for a lot of why DN is better.
i have much more fon plaing Dragonica
I'm in europe and in the sea dragon nest i've to much lag so i couldn'd enjoy Dragon Nest
but i thing these two games are realy diferent. the only thing both have is a name related with dragons and the same classes which all games have