Vita software, especially third party, is in a much healthier state than Wii U sw. Not just in Japan either.
it's about the same in america. there were only eight vita games released between january and june in america, and twelve for the wii u in that same time period. it gets really lopsided because of lego city undercover and monster hunter. if you take those two away, then wii u third party releases pretty much equal vita third party releases in the first half of the year (less than 100k).