Well let's see what you have to compare:
Dragongem has been closed for months, and they have given no official release date yet so we are left waiting for it like their little morons.
MapleStory is run by money hungry bastards that don't care if they ruin the community, they just care about their caviar stuffed lobsters that come on golden plates.
Ghost online grinding is the worst, not the time it takes to level, just the overall "fun" factor of grinding. On DG and Maple I can be leveling for hours, but on Ghost Online I can't stand grinding for 30 minutes.
Ghost online has PvP though, so it wins for now. Maple's PvP is a ****ing joke (in the other versions). I'm expecting Dragongem to be a lot better when it's released in the full version, hopefully at that point I can change my vote to DG. But for now, I vote
Ghost Online +1.