There is no "Free" MMORPG you go to that does not make you grind. How else will they make money?
As for my opinion -> 9Dragons is definitely better. There is some original concept in there. 2moons is just another hacknslash games with flashy animations and fishing.
If you're anyway interested in Asian cultures/legends/lore/whatever, 9Dragons does a pretty good job. I really liked the concepts of the clans and every job you choose (kungfu jobs) have different animations etc. We'll just leave the magic one out..because it's all fake anyways :P.
They're both grindfest. But I didn't notice the 9Dragons grind until level 30-40ish. I was practically falling asleep on my keyboard trying to get to 20 on 2Moons though.