It depends on the country. In Argentina to say "cool" it is often said: Buena Onda, Copado, Canchero,. I think that Canchero and Copado are the ones which fit best to the meaning of cool, and there are certain situations in which one or another is better to use. Also sometimes people just say "cool".

Soy la reina de la moda. Soy la más... y nada se pone a mayores Es en España. Norte.