I voted waltz based on just getting past rookie. I defined that as a few variations and moves. I stopped before getting into rise and fall or the salsa hip movement. When you started talking about intermediate I changed my mind. They are all about the same difficulty when you get to intermediate.
I think you also miss the "distinct flavors" of the dances. Here are my interpretations of their distinct flavors (others are welcome to disagree):
Waltz: Smooth, flowing, elegant. Rise and fall is one of the tools used to make work. Other tools are a formal posture and frame, and elegant arm movements. The variations are also calculated for smoothness.
Salsa: Energetic and sexy. The name means saucy. Does the held beat make it a bit more staccato than the other latin / rhythm dances? The hip movement and variations tend to promote sexy and the music is fast latin.
East Coast Swing (Substitute for and similar to lindy): Relaxed stationary dance with rotating moves. Lots of moves use one hand hold instead of a closed frame.
Argentine: Communications between the couple where the leader proposes and the follower interprets the lead. Very tied to the musicality, where a song is rhythmic the movements are rhythmic, where the song is melodic, the movements are smoother.
I think you also miss the "distinct flavors" of the dances. Here are my interpretations of their distinct flavors (others are welcome to disagree):
Waltz: Smooth, flowing, elegant. Rise and fall is one of the tools used to make work. Other tools are a formal posture and frame, and elegant arm movements. The variations are also calculated for smoothness.
Salsa: Energetic and sexy. The name means saucy. Does the held beat make it a bit more staccato than the other latin / rhythm dances? The hip movement and variations tend to promote sexy and the music is fast latin.
East Coast Swing (Substitute for and similar to lindy): Relaxed stationary dance with rotating moves. Lots of moves use one hand hold instead of a closed frame.
Argentine: Communications between the couple where the leader proposes and the follower interprets the lead. Very tied to the musicality, where a song is rhythmic the movements are rhythmic, where the song is melodic, the movements are smoother.