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: Black Box testing is just observation no need Internal Knowledge or structure of software product. just putting valid and Invalid data input and expecting the correct result. here tester find the defect but unable to Find the Location of defect.black box testing done in all testing level.

Black box testing tecniques are: 1. Equivalance partition 2. Boundary Value Analysis 3. Decision table 4. State Transition Diagram 4. Use case diagram

White Box Testing: White box is testing it requires the knowledge of internal logic and structure of software product. here we will check the loop, condition and branch. here we find not only the defect but also and location of defect.

White box Testing Techniques: 1. Statement Coverage 2. Decision Coverage 3. Branch Coverage 4. Path Coverage.