3DS have a long line up of children games, don't be fooled.
3DS actually have the same lack of good RPG, the same as VITA.
the 3ds has only one game rated for children, the rest are good for everyone, teens, or 17+. also, i dont feel a lack of rpgs on 3ds. i have soul hackers, paper mario, tales, crimson shroud, EO 4, MH3U, and devil survivor. SMT 4 is coming, if the new pokemon games look good i might get those as well. bravely default, projectxZone, oh and new mario and luigi game looks great. i have more games than i can play right now.