Again, I think Final Fantasy Explorers leans more towards being a bit more character-growth centric in its execution. Mon Hun is very loot grind-like, but Explorers has job changing and equipment wearing based on jobs, also share-able skills from class to class...
In short, it feels more... Final Fantasy ish? So I think for people who aren't totally keen on the Mon Hun thing and like their ARPG with a bit more magic and adaptability, this might be a nice fit. I also think this game will be good for people who are craving something a bit more Final Fantasy Crystal Chronicles-esque.