Surprising parallels: "startling" vs. "astonishing"

What is similar?

Both "startling" and "astonishing" are adjectives used to describe something surprising or remarkable that catches attention.

What is different?

While "startling" often implies a sudden surprise that may cause a brief shock or alarm, "astonishing" generally conveys a sense of wonder or amazement without necessarily involving an element of shock.

Which one is more common?