Tobi and Madara easily...
Sasuke couldn't take on the 5 kages even WITH help and Madara is fighting the 5 kages with ease. Naruto can't fight Tobi either without help, he needs Kakashi, Guy and Bee as backup, if he was alone he would have been demolished ages ago.
sasuke isnt strong enough to do anything and because of that naruto is slaughtered , a better match up would be naruto + muu + 3rd raikage vs madara + tobi