sasuke is not at the same level naruto is... we can only find out when 2 users of EQUAL power use it. Kakashi is not on the same level as the 4th thats for sure. But if there where two 4th hokages and use chidori vs rasengan on each other we could see some result.

You can say im stupid but im not bcuz then you didnt read this well. SASUKE IS NOT AT THE SAME LEVEL AS NARUTO . And when someone more powerfull uses a skill it is stronger than when someone who is weaker uses it.

If the 4th used chidori that tank would be so dead it cant even go to the next world . If sasuke uses it then ... gogogo read the manga.