I think Aurora would be way more scared than Snow White was, but that's just my opinion.

Well, I agree with your opinion. XD

She has almost the same reaction as Snow White when she's in the woods with Flynn. Snow White sees shadows and animals but thinks they're monsters. Rapunzel also overreacts with Flynn when she hears something in the bushes, thinking that it's something dangerous but it turns out to be a bunny that can probably smell fear.

Aurora, Rapunzel and Cinderella.
Possibly Ariel too because she's new to the human world and it might scare her at first - also maybe Jasmine since she's not used to that sort of stuff having never left the palace before (let's just pretend they have forests in Agrabah haha!)

Also Cinderella, Rapunzel and Ariel.

and Ariel

I think all of them would be except for Pocahontas but the most scare Aurora.

Absolutely. Rapunzel was brainwashed by Gothel into complete fear of nature and Gothel told her all those stories about large bugs, quicksand and other things as scare tactics so I'm sure she would freak out at first, although I think at some point she puts herself together and it happens very fast. It's like when she got out of the tower, she was happy to embrace the outside world, but then when something scared her she freaked out and then calmed down very fast. Aurora? She lived in the forest so I'm not sure. But I assume she would get scared of a dark forest that Snow White had to run through.

Or Rapunzel because sh had never been out of her tower before

Definitely her

Remember her reaction to the bunny?