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.
This battle depends on conditions. BP would manage to defend someone from Deadpool, Kill someone under Deadpool's protection, Capture him, wound him and win time, ... etc.
Black panther could also stop Deadpool's regeneration.
on the other hand, BP tried everything on Deadpool, but Wade didn't die.
In conclusion BP dominates over Deadpool, though if any of them finally dies, it would be T'challa.