If you were swimming in the open ocean, which of these scenarios would be more frightening?

Just a question to get the thalassophobia juices flowing LOL
If you were swimming in the open ocean, which of these scenarios would be more frightening?
A 100 lb shark deciding that you were its' meal
A 100 ton whale deciding that you were its' toy
Select gender and age to cast your vote:
If you were swimming in the open ocean, which of these scenarios would be more frightening?
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