Mabinogi ...being an MMO that is prone to change...
I've certainly spent a ton more time on Mabinogi than any other game (according to Xfire, more than the next top 10 put together) but then I started playing WoW at the same time that the game starting becoming broken, so I pretty much quit and went entirely to WoW. I went back to Mabinogi for a few months while my WoW guild leader was gone, and I've thought about doing so again until the next expansion comes, but I don't like the recent change to the combat system: I've heard human range got hit the hardest, and 400 base dex at rebirth is a significant time and AP investment I don't want to give up
So if you asked me about two years ago, I might have said Mabinogi
But now, I have no idea what to choose.