Splash Mtn just engulfs you from entrance to exit, and takes you right through the story. No matter how one may feel about the movie, it's still a wonderful ride. If you had put Tower of Terror on the list, which is based loosely on the tv show, I'm not sure which one I would have picked. I feel like I'm in a Twilight Zone episode when I go through the tower.
While Splash Mountain is VERY story-intense, it does not capture most of the actual "happenings" in Song of the South, in general yes. But the attraction that is more direct to the film I would say is Snow White's Scary Adventures. It starts with the I'm Wishing...goes into the castle, through the woods, the cootage, and the fight against the wicked queen. I'd say it's the most loyal of all...even though Peter Pan and Winnie the Pooh are pretty good at it as well.
I picked Peter Pan's Flight because I really believe that it takes you through the movie. From starting off in the nursery to flying over the city and into Neverland. And it takes you through in the sequence as the actual movie goes. My second choice would have been Splash Mountain because of the wonderful scenery an life-like characters. You feel apart of the story. The only problem I had with it is that it really doesn't go along with the movie it is based on. Song of the South has many different aspects to it that just aren't in this ride.