Honestly, as a portable system, the PS Vita is miles better than the 3DS. I bought my 3DS just for MOF, and after playing about 2 hours into the game I already regretted it. I wish I would have done what I did for CV Judgement, just bought the game for the sake of my collection and thrown it in the bin with the rest of them.
MOF missed the mark, and it's painful to type that out because I was sooo excited for this game before it came out. The 3DS is ok, but it's worth the extra $75 to just get a Vita, especially if you have any plans of getting a PS4.