The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
+Stronger
+Faster
+More experienced
+Better Pain Tolerance
-Lacks Versatility
-has no resistance to like at least 80% Naruto's Abilities and Hax.
Naruto:
+Better AP
+More Durable
+Superior battle IQ
+More Agile
+More Powerful
+Way better Hax.
-May be hard to hit Nolan due to his massive speed advantage.
Conclusion: while Omni-man is Strong there is no doubt in that, he Lacks the AP to put Naruro down, has no resistance to the Majority of Naruto's Abilities, and Naruto should be fast enough to React to Omni-man in terms of C/R Speeds.
So Naruto ends up winning(mid difficulty)
omni-man is built different.