Base Sasuke > Base Naruto
This was already shown at the beginning of Shippuden when Sasuke was negging Naruto. Naruto just has the base Rasengan whereas Sasuke has Chidori (slightly inaccurate due to not having Sharingan but will do just fine in a linear clash) AND its multiple variants (no need of Sharingan for these), Fire Style jutsus, greater strength and speed, much superior taijutsu and kenjutsu. This makes Sasuke massively superior but Naruto has shadow clones to reduce the disparity.
3T Sasuke >> Base Naruto
On top of the advantages mentioned above, Sharingan will grant Sasuke perfect tracking and precognition ability which Sasuke might not even need for Base Naruto. Not to mention it will allow Sasuke to potentially one-shot Naruto with genjutsu.
3T Sasuke < Pain Arc SM Naruto (with prep, no summons), 3T Sasuke <= Pain Arc SM Naruto (without prep, no summons)
SM Naruto equals or surpasses almost all of 3T Sasuke's formerly held advantages. His strength is much superior, speed is equal or slightly superior, taijutsu is equal but more effective due to superior physical parameters plus Frog Kata being a strong and dangerous taijutsu move, and stronger Rasengan and FRS compensates for Sasuke's ninjutsu advantage (less versatility but more power). This time Sasuke's Sharingan will be actually put to use in predicting Naruto's increased speed and reflexes. Naruto's sensing allows him to avoid Sasuke's genjutsu as well.
3T Sasuke << War Arc SM Naruto (with prep, no summons), 3T Sasuke < War Arc SM Naruto (without prep, no summons)
All of Naruto's above mentioned advantages are increased or enhanced even further. Aside from the bump in physical parameters and taijutsu, his ninjutsu is now significantly superior due to bigger Rasengan and FRS variants.
Peak MS Sasuke >= War Arc SM Naruto (with prep, no summons), Peak MS Sasuke > War Arc SM Naruto (without prep, no summons)
Give 3T Sasuke (who is already equal to Pain Arc SM Naruto without prep) larger and more powerful chakra (increased physical parameters as well as stronger ninjutsu) as granted by MS, and he'll be around Pain Arc SM Naruto's level including prep. Add Amaterasu and Blaze Release, and Sasuke easily gains the edge because it is stronger and deadlier than Frog Kata or anything Naruto has. Peak MS Sasuke (as shown in the manga) has Susanoo upto V4. MS Sasuke with V3 Susanoo could fight on par with War Arc SM Naruto using Susanoo weaponry. Give the empowered defenses of V4 and he's comfortably equal if not slightly superior than War Arc SM Naruto with prep.
Hypothetical War Arc MS Sasuke > War Arc SM Naruto (with prep, no summons)
If MS Sasuke continued till War Arc, then he'd be much stronger than before just like how SM Naruto got till the war. This would grant Sasuke time to progress and he'd gain enhancements to all his MS powers with better proficiency. His Susanoo might have reached other levels, perhaps till legged V3 or maybe higher. Previously, MS Sasuke equaled or slightly edged out War Arc SM Naruto with prep. This power increase would put MS Sasuke above War Arc SM Naruto with or without prep, rather comfortably.
