Who's chakra is stronger, Sasuke or Narutos

[Holy God]

Scan or just assumption.
He draw chakra from bijuus to fire up the arrow for his biggest clash. Which is shown clearly as day.
It was 1vs9. So if 1 can cancel 9 mean 1 is stronger chakra. You can never deny that fact.

You can find the scan of Sasuke trying to get more tailed beast chakra in chapter 697. It's no assumption. We also see Sasuke's Susano'o with a large amount of their chakra still in it even after he shot his last Indra's Arrow.

Then you may also be forgetting that Naruto absorbed a large amount of natural energy to power his last attack. It wasn't all Kurama's and Naruto's. Another thing you may also be misdoing is giving Naruto the quality of Kurama's chakra. They each have their own separate source.