And as much as you hate Caitlyn's traps that don't move, tristana can plop a bomb on you in any fight and take out a massive chunk of hp at level 1. 209 damage (before armor) to be exact if she is not running fervor, and has only 70 AD.
My point in bringing her up was not that she is better than cait, it's that cait is NOT the safest ADC in the game: "It takes a massive amount of diving power to get to her, more than any other ADC."
Tristana matches, and improves, on the difficulty to reach her. The only difference in their ability to kite is that caitlyn has to pre place traps and stay behind them to stay safewhile having a 400 unit jump, tristana can just knock you away 600/800/1000 units with a 900 unit jump.
sure, you fight in a choke point with no way to get over walls, a caitlyn is going to be untouchable if she can free hit from behind her traps. But tristana is much harder to flank, harder to stick onto once you reach, has a higher range at level 16 (I made a bad bit of math based off previous numbers, as her range increases by 7, not the 9 i had thought it did) AND tristana can interrupt things like a kat ult, velkoz ult, etc and shove away divers such as wukong, tryndamere, Yi, Amumu, Lee sin, Warwick.....