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.
I belive they are fairly evenly matched in some ways, bouth got enhanced physical abilities like strength, dexterity, agility and speed.
Bouth are very strong and may lift in excess of 1500 ibs perhaps even twice as much and may move at incredible speeds in combat
Wolverine got superior durability and stamina because of the adamantium skeleton and the power of regeneration.
Deathstroke also got an enhanced healing ability but not at the same incredible level.
To suggest who is the superior fighter is not very easy bouth got incredible skill and belongs to the very best in all of comics.
But if using logic Wolverine is probably three times the age of Deathstroke and is more expirienced.
Deathstroke got more weapons and may attack Wolverine from a distance but nothing he got may put the Mutant down.
In close combat Slade use specialiced and deadly swords of incredible quality.
Characters with less durability and healing ability would be killed in an instant if hit by the swords that penetrate armor.
However Wolverine may not be split by anything and heals when penetrated or shot.
This will not be the case when Wolverine attacks with the adamantium claws, they will cut threw anything.
Slades sword, armor and body will be cut straight threw like butter in the sun.
Deathstroke may evade some attacks and also hit Wolverine but this correlation may not last for long.
The Mutant may even choose to take a couple of hits to deliver a devastating attack leaving the enemy bleeding on the ground.
Wolverine will most definitely be the winner if thouse amazing characters engaged in battle.