Nostalrius Begins - Quality wow vanilla realm (1.12)

Which one would add more damage? Im assuming Humanoid Slaying since you also get the crits thing, but dont want to be wrong..or is it alot more complicated ?

Ranged weapon specialization is better. 5% overall range weapon damage vs 3% damage to only humanoids, and 3% crit damage increase, not crit chance, so if you're crit is for 1000, you'd only get a 30 damage increase, vs 5% overall damage.