for an azure fang main and compared with normal zabuza... i think fuguki would be giving you a better results at the overall benefits and on the power potential that he can gain in azure fang teams...zabuza would be working better with midnight blade main i think since he is a sword user unit and also fuguki ( samehada)....but fuguki ( edo tensei ) can go on a great harmony specially with azure fang i think...hope this may aid you on making your decision....

thanks bro sorry took too long to respond haha, busy you know.