Originally Posted by Tankard
Don't you mean Amarillo is a supercharged cascade?
Amarillo is a very distinctly pineappley flavor. Centennial is very grapefruity, like Cascade is. Summit is so wildly tangerine that I can't believe it's a hop, sometimes.
Amarillo complements Cascade nicely, but it is not nearly the same flavor, while Centennial is much closer.