naruto could probably use the rasengan over and over again only because he possess a fast amount of chakra. its been said the rasnegan is more powerful than chidori, you can tell just by the kind of mark it made on the watertanks in the sasuke vs naruto battle (rooftop)

but thats the kind of hole it makes, i'm not sure i've seen rasnegan puncture anybody yet where we've seen chidori/raikri puncutre two people....three? (kakashi-haku, sasuke-naruto, sasuke-garra? (i dont remember last one)

isso, i made that kind of comparison already, rasnegan is more of a bolt while chidori is a nail.