Tristana vs. Graves
Her base damage numbers are weaker than Graves's, and even though her E scales better with bonus AD than his Q does, he's got the AD ratio on the ult to compensate.
His AoE slow has added utility, hers adds extra damage instead, but when used as a slow puts Tristana in melee range, which seems slightly counterproductive for a longrange squishy ADC.
She gets more attack speed for a longer period of time, but the cooldown on her Q is so long. Graves gets a dash combined with a small amount of attack speed on a short cooldown that gets shorter when you basic attack enemies.
I think in a vacuum, with equivalent items, a Tristana could easily outplay a Graves and win the 1v1, but in real teamfights, especially teamfights with really mobile tanks like Sejuani or Nautilus, Graves seems capable of safely throwing around more damage with his spells and disruption, while Tristana seems like she'd transition into more of a dedicated assassin, though her spell damage seems lacking for such.
There aren't a lot of situations I'd want to pick Tristana over Graves. Thoughts?