Lol the real thing is that Raizo has really a chance to win this. If Naruto is not Kyubi mode, beginning of part 2 in not that dangerous and strong.
Raizo strength is a higher. OP character are a lot stronger physically on average than Naruto character.
Raizo is also fast. Kinemon can tango with Brook, and is likely hypersonic+, Raizo is at least comparable.
Raizo can do ninja skills : he can shadow clones, replacement skills, fog jutsu, can send shurikens like a boss etc.
Raizo has also haki and his haki is good enough.
Raizo has also his scroll skills : he can absorb an attack and send it back. Did it with boro breath. I think he can totally do it with Rasengan.
Raizo for the win !
Against 3 tails Naruto or 4 tails this will be harder. (Orochimaru fight)