However, even if you are talking strictly Japan, Tales performed better on 3DS than on Vita (all Tales games for those platforms were ports / remakes, so it's equal ground) in Japan. I don't know about worldwide sales but considering Vita's state in the West, it's probably safe to assume that this also holds true in the west.
In the end my point is: The best strategy for a technically not all too demanding series like Tales where there are fans on several platforms - even if the amount of fans on PlayStation devices is higher than on other ones - would probably be to make multiplatform releases for Wii U (if it recovers somewhat), PS4, and maybe Xbone if an overseas release is planned. This is not including any money hatting into the discussion of course. You also have to remember, that JRPGs in general are not all too much tied to any specific platform, Nintendo systems at least get quite a few good JRPGs, too, so it's not a case (like the platformer genre lately) where there is simply no ground for this genre on any other platforms.