To provide a cap to this discussion:
3DS
Samurai Warriors Chronicles (2011)
Dynasty Warriors Vs. (2012)
Samurai Warriors Chronicles 2nd (2012)
Vita
Dynasty Warriors Next (2011)
Dynasty Warrriors 8 Xtreme Legends (2013)
Dynasty Warriors Gundam Reborn (2013)
One Piece Pirate Warriors 2 (2013)
Warriors Orochi 3 Ultimate (2013)
Samurai Warriors 4 (2014)
So Vita has more Warriors games, but 3DS has the two prequels to this game.