I don't think it's fair to assume that one storyline is more "scary" than the other with how little we actually know right now. A rabbit being chased by a bear and a fox certainly adds an element of suspense / tension to the ride, but I wouldn't call it "scary." Especially when you consider the actual story element to Splash isn't really revealed until you're actually on the ride, aside from some light teasing in the queue. There's no reason to assume TBA won't take the same approach, especially with how much of the ride experience itself they're keeping under wraps. We can't possibly know that the ride is devoid of all conflict until it opens and we can see for ourselves, or we're explicitly told so. First timers are not basing their decision to ride on the storyline, something they know nothing about if they haven't ridden before. They're basing it off the drop, briar patch or not.