Well if you ask me which cover I'd choose between these two:
Obviously it'd be the one on the left side. That's the one I have at home so to match, I tried to find a US hard copy of the second book with this cover:
But alas, as far as I know, there is none. So I just relented and bought this instead:
Liked the first book, by the way. Have you guys read this series? TEAM REN! Hahaha. Anyway, what do you think of the cover change?