Publishing data under Creative Commons license: CC0 or CC-BY?
CC-0 is considered the best choice for scientific progress because it lowers barriers to reuse.

Dryad has a nice and compelling explanation of why they require CC-0 in their FAQ https://datadryad.org/pages/faq#info-cc0

Here is one excerpt:


  CC0 does not exempt those who reuse the data from following community norms for scholarly communication, in particular from citation of the original data authors. On the contrary, by removing unenforceable legal barriers, CC0 facilitates the discovery, reuse, and citation of that data.