Ok...in terms of playability between Shodouphone and Sushi Changer...i would say Sushi changer because it can sort of summon all ten origamis.
Plus the folding disc is fun to play.
But if you want innovative henshin style...maybe the brush mode of Shodouphone can entertain you.
However,both are quite similar in a way...
But,if Shodouphone had this sensor installed in it like Gongchanger,making sounds only when you wave it,then i would recommend you to get it.
But since there isn't,Shodouphone and Sushichanger are on same level,it depends whether you like the main 5 or Genta.