I also prefer Princess Kako's tiara. It slightly reminds me of her mother's tiara, which is the best of all the three in my opinion. Here's a photo of her with Crown Princess Masako wearing the tiara which used to be worn by the Empress.
--Previous Message-- : Comparing both parures I must say I prefer : Pss Kako's. I hope we will get the chance to : see these jewels worn by the princeses at : oficial events .