Are you talking about cryptography and data science ? If yes, then they can't be compared actually. Cryptography is a all about peer to peer network where everything is decentralized. Like there doesn't exist a single king like client server network. Now a days many companies are changing their system and implementing blockchain there.
And about data science ! It's actually not a new sector, just programming language used to implement new algorithms have been changing day by day. Here you've to research and develop efficient systems.
You can choose any of them according to your interest. Also you can study both of them.
Completely depending on your choice.

Warm regards.

KLESCET

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