Should I go for CCA175 or CCA159?

I am having 3 years of mainframe experience and want to switch to BigData industry. Should I go for CCA175 or CCA159. I have good SQL knowledge and a good command over transforming data tasks.

I want to get over with the certification by May end. Which certification would be better for my profile to get my foot in the big data industry?

@itversity Can you please comment on this?