TrueSephiros
Blue Mage
depending on what you're "grinding" for, TrueSephiros. if you're going for license points, then i agree it was way too easy to get everything for everybody. however, leveling up the characters to 99 seems to take way longer than it should.
and finally, i never did like the term "grind". sounds... stupid.
Actually leveling isn't that hard, I just recently was stuck on where to find Vyern or w/ever her name was so I got angry and just started Power Leveling, I got up to level 45 doing that. The Leveling system in here isn't that bad, if you think it's that bad, try the older FF games, like IV or V, there regular battles are much, much more harder and to level them up is much more difficult.
Even in VI with the exp. egg it took forever to get a character to level 99, because you had to solo in order to recieve the best exp, and the sphere grid is imo, my most despised leveling system, try to get everyone to complete the sphere grid and you'll know what I mean.
I guess having accomplish those, XII's leveling system isn't too bad for me at all.