User blog comment:N00bpl0x/Why are some ADCs considered superior to the others/@comment-60764-20130701182811

It all depends on how they scale with gear and how they often they can stay/stick in a fight, as well as the depth of their kit. It's like an orge, it's got layers.

To this end, compare Vayne and Draven. Both get free stats/damage in the form of their q's, but one is objecively stronger than the other whilst having more uptime. Both get steriods (Vayne's ult and Draven's W) and both get have displacing abilities that make them hard to gank or stick to. Because of the Q and a couple other factors, Draven makes for a better carry.

This is the kind of comparison people do with every character in the game and their respective roles.