State all the info and without excluding what you don't like when discussing Facts.
It was a Kyuubi Rasengan.
Yes. Go and reread the first part.
What are you taking about wind > lightning. Wind rasengan will always be stronger than chidori /raikiriWell if we go by Rank here what we have
Chidori A Rank = Rasengan A Rank
Chidori A Rank < Wind Rasengan S Rank
Rakiri S Rank = Wind Rasengan S Rank
Rakiri S Rank < Rasenshuriken beyond S rank stated by Kakashi in rank
Remember this
What are you taking about wind > lightning. Wind rasengan will always be stronger than chidori /raikiri
i said Chidori>Rasengan if u have ur oppinion thats fine, this is mine.
I like to point out something that most members are missing, Rasengan is a incomplete jutsu, that is stated by Kakashi. Rasengan is the highest level of chakra manipulation, while it doesn't have element nature.
When Naruto combined his wind element to Rasengan to make Rasenshuriken, that became the complete rasengan.
Rasengan = Chidori
Wind Rasengan > Chidori
Rasenshuriken >> Chidori
As for Sasuke using Chidori + Amaterasu, Naruto Rasengan didn't look like it was enhanced by Kurama power or Wind element or natural energy.
Sorry mate , but rasengan was never shown to be equal to chidori , rasengan was always superior even as a incomplete jutsu

Kabuto had to start healing early just so Narutos small Rasengan didn't kill him.
Sm Naruto killed one of the pains inside gamabuntas mouth with a Rasengan
Jaraiya killed a path also with a small Rasengan
I think Rasengan is better than chidori. back in part one, even kakashi said he could only use chidori like 5 times a day and sasuke was only able to do it twice. Naruto used rasengan whenever he wants too. Plus u could add lightning release to the rasengan if that was your nature type and you can throw the rasengan and whatever. Chidori is just chidori.
Ok, so why don't Kakashi use Chidori instead of Rakiri directly ?
You must be registered for see links
"The Lightning Cutter is an enhanced and concentrated form of the Chidori with the same effects and drawbacks. "
Can't be more explicit. Maybe I'll change my ranks but Chidori are not exactly the same. I am both right and wrong.
Sasuke can manipulate chakra to fit him though. That's how he was able to collect chakra from all 9 tailed beasts and use it for his techniques.You must be registered for see images
Just to make things clear, there was a good reason why naruto had to match kurama's chakra to every SA member based on the ninja. Sasuke was using chakra that wasn't fit for him, causing his jutsu power to be seriously weaker. Hence, he uses amateratsu to give his chidori the power it lost. The reason they both lost a arm is because, they have never been that weak when they clashed with everything they have left. Both rasengan and chidori are A rank moves,both are difficult to learn and both are capable of ending someone's life.
I dont think its better, since when both jutsu collided it was always the same story: a draw. But let me tell you this: If Minato hit Obito with Chidori instead of Rasengan, the latter would be probably dead, or at least very badly hurt.