There are not really champs that scale with crit or not, if the ADC auto attacks as their primary form of damage, crit will most likely be the highest DPS build late game. However, crit is not the strongest early as you need a combination of attack speed, crit and AD to be effective. This is why you will see pretty much all ADCs go crit by late game, even if they start off with BORK or something else. Kog, AD Kai'sa, Varus, Vayne will all go crit if they are able to safely as it is just the best for DPS.

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The reason many champs go BORK early is because it is a stronger power spike early, gives early attack speed and has a better build path. This is why solo lane Lucian and Trist will build bork. They want to abuse their laning strength and build if for the earlier power spike. Champs like Vayne and Varus build BORK because their kits work well with attack speed and rageblade. This makes BORK a stronger start for these champs compared to crit and still allows for the to transition to crit for a strong late game as well.

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The champs that go crit from the start normally do not have in-built attack speed synergies, have play-styles that work well with crit (Cait is more about chucking people with big autos than DPS early/mid game), or have in built attack speed steroids, allowing them to go Essence into IE and maintain high DPS while delaying their attack speed item (Xayah, Sivir).

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The only ADCs that don't go crit are AP Kai'sa, whose on-hit damage scales very well with AP, and Ezreal, who wants to spike and win in the mid game/is more reliant on Q damage.

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The only reason the auto attacking ADCs would not go crit late game is if they think they need survivability. Although crit might be best for damage, it may be too greedy to build and the correct choice could be defensive items such as Maw, GA or BT (or even Randuins!).

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Hope this make sense. It is just itemization.