Should black box or white box testing be the emphasis for testers?

Question

Which type of testing would you say should be the emphasis (for testers/QAs), and why?

A quick set of definitions from wikipedia:

Black box testing

Answer 1

*Black-Box testing: If the source code is not available then test data is based on the function of the software without regard to how it was implemented. -strong textExamples of black-box testing are: boundary value testing and equivalence partitioning.

*White-Box testing: If the source code of the system under test is available then the test data is based on the structure of this source code. -Examples of white-box testing are: path testing and data flow testing.