Each has its won merit. I like how Hashi enters(attains) his Sage Mode, Kabuto owns looks badass and Naruto's own has a mean power up....hard to decide but I went with Hashi's...
Frogger mode, I like the eyeshadow. I also like Hashirama's but not really liking a circle on my forehead plus physical resistance in frogger mode makes it a nice addition.