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.
Scarlet witch win low - mid diff (Wanda - Wandavision to Multiverse of madness)
(Warning: My opinion only)
Wanda has demonstrated that she has automatic shields and healing factors. Wanda doesn't need an incantation to cast a spell; she can simply protect herself using her shield. In "What if," she demonstrated that her shield stopped some bullets; I believe if flash get close to her, he could be interrupted and stopped. Additionally, inside Wanda's hex, she has the ability of probability manipulation and chronokinesis (time manipulation). For me, the Scarlet Witch wins. After Mom.
"Magic on autopilot" - Agatha harkness