I recommend Senran Kagura 2 to any and all Nintendo 3DS owners. It has some room for improvement, but is still an absolute must-buy.
Such a game is a bit of a tough act to follow, so I wasn't nearly as excited for Senran Kagura: Estival Versus on the Vita, especially since it follows the more competitive aspect of Shinovi Versus. I still got it, of course, in the Endless Summer Edition that came with a third 2-disc soundtrack, second art book and holographic cards.
That increase in content is indicative of Estival Versus itself, because it's definitely the biggest, fanciest Senran Kagura game yet.