Sasuke showed us throughout Part 2 that he is very talented in shape manipulation. Notable jutsus:
1. Chidori spear
- He can shape his chidori into a very long sharp spear.
2. Chidori senbon
- Impressive shaping of chidori into finely sharp needles.
3. Enton manipulation
- He can shape Enton into blade and arrow.
Who has shown better shape manipulation than him, pre Rikudou power-ups.
Naruto while good at his Rasengan and its variation, still needed Bunshins or chakra arms to be able to shape them well. Still not as impressive as what Sasuke did though IMO.
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Naruto is the most skilled in Shape manipulation. Kakashi explains that chidori uses both natural transformation (physically recompose) and shape manipulation (spatial recompose)
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Kakashi called Naruto's base Rasengan "extremely advance spatial recompose"
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. If base Rasengan is like that then what about Oodama rasengan? Chou Rasengan? RasenShuriken which makes millions of tiny blades that attack on a cellular level? And the other Rasengans he's shown? If the base Rasengan is already at such a level then this higher level Rasengan's which are larger forms and uses more chakra control would be far higher level in shape manipulation and chakra control than what we seen from Sasuke.
Rasengan is an A rank jutsu, 100% shape manipulation while Chidori itself is half natural and half shape manipulation, both jutsus variations would further increase what they need but Rasengan being solely shape Manipulation puts it on top