Kings and Aristocrats are both elegant
Seriously though, I would thing elegance is mostly down to the player. "Elegant" tone is even harder to define than the much used "bright," "dark," "round" etc.
In general, Zephyrs are more free blowing and Crats are more resistant but both are very well made, versatile horns. You can't go wrong with either one, and whichever one is more elegant is a matter of personal preference.