Sasori and Deidara, low-mid diff. It took Orochimaru enraging him to even get him into the four tailed chakra cloak form, which Sasori and Deidara really wouldn't be able to do, at least not to the same level Orochimaru did. At this point, Sasori and Deidara were far more skilled than Naruto, with greater experience and more powerful jutsu. Even if Naruto were in the chakra cloak form, he still wouldn't stand a chance against the two of them - a sick and jutsu-less Orochimaru easily held his own against him, I think two very powerful and skilled shinobi with excellent teamwork and unique jutsu would be able to finish him off.